The effect of predation on the community structure of fresh-water zooplankton - S. I. Dodson (1970)

A Monograph of the Lupinus ornatus Complex - B. J. Cox (1970)

Pharyngeal and lingual adaptations in the beaver - R. W. Coles (Journal of Mammalogy, 1970)
Journal Article Pharyngeal and Lingual Adaptations in the Beaver Get access Richard W. Coles Richard W. Coles The Biological Laboratories, Harvard University, Cambridge, Massachusetts (present address: Joint Science Department, the Claremont Colleges, Claremont, California 91711). Search for other works by this author on: Oxford Academic Google Scholar Journal of Mammalogy, Volume 51, Issue 2, May 1970, Pages 424–425, https://doi.org/10.2307/1378510 Published: 01 May 1970 Article history Accepted: 23 January 1970 Published: 01 May 1970

A study of false hellbore (Veratrum californicum) - K. A. Loy (1970)

A contrast of the vascular vegetation found in an old sagebrush community and a new one - Watson Smith (1970)

Succession in pond C of the Kettle Ponds, Gothic, Colorado - S. Wynne (1970)

Alpine vegetation and soils of Mesa Seco Plateau, San Juan Mountains, Colorado (1970)

Effects of Size-selective Predation and Food Competition on High Altitude Zooplankton Communities - W. G. Sprules (1970)

The distribution of Somatochlora semicircularis - P. M. Deaton (1970)

Algae of a beaver pond - V. Lawry (1970)

The Diadematus group of the orb-weaver genus Araneus north of Mexico (Araneae: Araneidae) - H. W. Levi (Bull Mus Comp Zool, 1970)

Contrasting population biology of two species of butterflies - Peter F. Brussard; P. R. Ehrlich (Nature, 1970)

Comparison of vegetation on granodiorite and limestone outcrops on similarly facing slopes near south bank of Judd's Falls - L. A. Herbst (1970)

Part I: The Wolfcampian Joyita uplift in central New Mexico: Part II: Fusulinids of the Joyita Hills, Socorro County, central New Mexico - Wendell J. Stewart; Frank Ε. Kottlowski (1970)
The present-day Joyita Hills (Los Cañoncitos) is a complex which, adjacent to the hills, gradationally overlie Bursum Cenozoic horst on the east side of the Rio Grande graben in purplish-green shales and limestones. north-central Socorro County, New Mexico. Previous reports Joyita Hills area, lying east of the Lucero basin and south- postulated a nearby uplift during late Desmoinesian, Mis- west of the Estancia basin, was a submarine platform with sourian, and Virgilian time coextensive with the Peñasco or small, low islands during Atokan and Desmoinesian time, as southern Uncompahgre landmass. attested by black Atokan shales and Desmoinesian arkosic limestone-pebble conglomerate. The thinness of remnant Recently (1963) Missourian fusulinids were identified from upper Pennsylvanian strata is believed due mainly to erosion upper Pennsylvanian limestones in the Joyita Hills. Early during early Wolfcampian time, not owing to erosion during Wolfcampian Bursum-facies arkosic limestone-congl

Larval food plants for Colias alexandria: a survey of the distributions of Lathyrus leucanthus and Vicia americana near Gothic, Colorado - L. R. G. Snyder (1970)

A study of interactions within a marmot family - P. Coffin (1970)

Adult behavior and population structure in Erebia epipsodes (Lepidoptera: Satyrininae) - Peter F. Brussard; P. R. Ehrlich (Ecology, 1970)

Conundrum meadow - D. Ditto (1970)

Biosystematics and Phytogeography of the Erigeron simplex complex - S. Spongberg (1970)

A comparative vegetational study of two kettle ponds in the Gothic area - Richard L. Reynolds (1970)

A comparison of two ponds at Mexican Cut - L. Lippman (1970)

Stimulation of territorial aggression in the dipper; Age determination of the nestling dipper - E. Dixon (1970)

Dinamoebidium coloradense Spec. Nov. and Katodinium auratum Spec. Nov. in Como Creek, Boulder County, Colorado - Adam S. Bursa (Arctic and Alpine Research, 1970)

Experiments with soils - S. P. Bratton (1970)

The ecological dynamics of alpine krummholz - P. B. McEvoy (1970)

Ecology of aspen in Gunnison County, Colorado - M. D. Morgan (American Midland Naturalist, 1969)
The ecology of quaking aspen was studied in Gunnison County, Colorado. In the study area, aspen stands often take the form of small islands surrounded by fescue grasslands. At its upper altitudinal limits, aspen generally abuts the spruce-fir forest. The greatest number of trees were 4- to 7-in DBH with only a few being greater than 10-in DBH. Aspen reproduction is evident, but many of the trees below 4-in DBH were dead. The aspen understory is very lush and is characterized by many tall herbaceous species. The disjunct distribution of several understory species does not seem related to soil or aspect conditions. Aspen soils are generally more fertile than adjacent spruce-fir or fescue grassland soils. All soils possessed several characteristics of immature soils: 1) little variation in silt and clay content throughout the profile, 2) little horizon and structural development, and 3) little variation in per cent base saturation throughout the profile. Aspen seed retained good viability

Adaptive significance of pigment polymorphism in Colias butterflies. II. Thermoregulation and photoperiodically controlled melanin variation in Colias eurytheme - W. B. Watt (Proceedings of the National Academy of Science, 1969)

Carbon Isotopes in Pelites of the Precambrian Uncompahgre Formation, Needle Mountains, Colorado - IRVING FRIEDMAN; F. R. E. D. BARKER (Geological Society of America Bulletin, 1969)
Research Article| July 01, 1969 Carbon Isotopes in Pelites of the Precambrian Uncompahgre Formation, Needle Mountains, Colorado FRED BARKER; FRED BARKER U.S. Geological Survey, Denver, Colorado Search for other works by this author on: GSW Google Scholar IRVING FRIEDMAN IRVING FRIEDMAN U.S. Geological Survey, Denver, Colorado Search for other works by this author on: GSW Google Scholar GSA Bulletin (1969) 80 (7): 1403–1408. https://doi.org/10.1130/0016-7606(1969)80[1403:CIIPOT]2.0.CO;2 Article history received: 04 Nov 1968 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation FRED BARKER, IRVING FRIEDMAN; Carbon Isotopes in Pelites of the Precambrian Uncompahgre Formation, Needle Mountains, Colorado. GSA Bulletin 1969;; 80 (7): 1403–1408. doi: https://doi.org/10.1130/0016-7606(1969)80[1403:CIIPOT]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Boo

Home range and longevity in Zapus princeps in Colorado - L. G. Myers (American Midland Naturalist, 1969)

Sound location of insects by the dwarf weasel - R. L. Willey (American Midland Naturalist, 1969)

The taxonomy and ecology of the tiger salamander of Colorado - R. W. Reese (1969)

Visual and acoustical social displays by the grasshopper Arphia conspersa (Orthoptera: Acrididae) - R. L. Willey (Psyche, 1969)

Dikes of the McClure mountain — Iron mountain alkalic complex, Fremont county, Colorado, U.S.A. - D. H. Dahlem; E. Wm Heinrich (Bulletin Volcanologique, 1969)

A study of plant succession on the Gothic earthflow - S. Turbak (1969)

A change in status of Lupinus homicola var. tetonensis - D. B. Dunn; B. J. Cox (Transactions of the Missouri Academy of Science, 1969)

Micro-environment of the water ouzel - J. Wahl (1969)

Radio tracking of dispersing yellow-bellied marmots - H. W. Shirer; J. F. Downhower (Transactions of the Kansas Academy of Science, 1969)

The biosystematics of the Lupinus argenteus complex and allies - Lloyd William Hess (1969)
"Introduction: For many years there has been great confusion in the nomenclature of Lupinus. Many authors have contributed numerous names as they interpreted the morphological variations. Since the work of Sereno Watson (1873) there has not been an attempt to make a monographic study of the perennial lupines of the United States. Individual authors have attempted to work up the treatment of Lupinus for their particular state without reference to the taxa described in neighboring areas. It was believed that a careful monographic study of related taxa was badly needed and could help clear-up some of the confusion. The large flowered members of the Lupinus argenteus complex and its apparent relatives were selected as a group extending widely in the Rocky Mountain area, which could be studied as a starting point. Since three taxa of this group existed in the Crested Butte area (near the Rocky Mountain Biological Laboratory) it was believed that work on the possible genetic barriers could b

Introductory field investigation of the distributional ecology of the Anostraca (Crustacea) of north-central Gunnison County, Colorado - P. L. Nelson (1969)

A note on the occurrence of violarite, Copper King Mine, Boulder County, Colorado - William H. Bird (Economic Geology, 1969)
Violarite from the Copper King mine, Boulder County, Colo., occurs as a secondary mineral after pentlandite. It is associated with fresh pyrrhotite and with several altered forms of pyrrhotite including secondary pyrite after pyrrhotite. Hence violarite has a much broader stability range in the oxidation environment than was previously suspected.

Flexural Slip as Indicated by Faulted Lava Flows along the Grand Hogback Monocline, Colorado - Frederick N. Murray (The Journal of Geology, 1969)
Lava flows southwest of Glenwood Springs, Colorado, have been broken by numerous faults with a few tens to several hundreds of feet of perpendicular separation. Flexural slip in steeply upturned Upper Cretaceous and Tertiary strata beneath the lava flows is believed to be responsible for this faulting. Tilting of the basalt and adjoining basalt gravel surfaces, as well as simple flexural-slip model experiments, seems to indicate that faulting was the result of a partial unfolding of previously folded strata. Subsidence of the uplift between Glenwood Springs and Carbondale or rise of the basin in the vicinity of the faulted lava by a few thousand feet since the basalt was formed is offered as an explanation.

A brief survey of the mushrooms in the spruce-fir forest of the Gothic, Colorado area - D. B. Dunn (1969)

Flora of the Gunnison Basin, A study in plant distribution - J. Barrel (1969)

Field studies on Peromyscus maniculatus - S. J. Graetz (1969)

The geology of Treasure Mountain Dome - F. Mutschler (1969)

Flora of the Gunnison basin: a study in the distribution of plants - J. Barrell (1969)

Phenetics of natural populations. IV. The population asymmetry parameter in the butterfly Coenonympha tullia - B. Baker; M. E. Soule (Heredity, 1968)

Electrophoretic study of chipmunk blood near Gothic, Colorado - L. Oakland (1968)

The activity schedules of some small mammals of the Gothic Area - K. R. Lamar (1968)

A new sibling Papilio from the Rocky Mountains, with genetic and biological notes (Insecta, Lepidoptera) - C. L. Remington (Postilla, 1968)

A vegetational comparison of the Gothic and Galena Mountain areas - B. J. Cox (1968)

Suture-zones of hybrid interaction between recently joined biotas - C. L. Remington (Evolutionary Biology, 1968)
From a study of the geographic occurrences of contemporary hybridization among North American animals, it has become apparent that most of the hybrids are produced in a few relatively localized zones, with little hybridizing in the vast areas between these zones of mixing.

Growth substances from Veratrum tenuipetalum - H. O. Olney (Plant Physiology, 1968)

A vegetational comparison of the Gothic and Galena Mountain area - B. J. Cox (Transactions of the Missouri Academy of Science, 1968)

New County Records in the Herpetofauna of Colorado - Wesley M. Brown; D. M. Secoy (The Southwestern Naturalist, 1968)

Factors affecting the dispersal of yearling yellow-bellied marmots - J. F. Downhower (1968)

Water resource development in the Arkansas Valley - John Robert Ferrell (SHAREOK (University of Oklahoma), 1968)
o c i e t y \^" P o rk L overs Are No C r e d it to Our D em ocracy," Life, LV (S ep te m b er 6 , 1 9 6 3 ), I4., * Ib id .

Plant-herbivore coevolution: lupines and lycaenids - D. E. Breedlove; P. R. Ehrlich (Science, 1968)
Predation on lupine flowers by larvae of a lycaenid butterfly was studied by comparison of inflorescences exposed to and protected from infestation, and by comparison of lupine populations exposed to different degrees of attack. The lycaenids caused striking reduction in seed set, indicating that this small herbivore could act as a potent selective agent in lupine populations.

Introduction to a study on the diatom distribution in the East River, Gunnison County, Colorado - S. M. Miller (1968)

Adaptive significance of pigment polymorphism in Colias butterflies. I. Variation of melanin pigment in relation to thermoregulation - W. B. Watt (Evolution, 1968)

Water ouzels - S. Wise (1968)

A study of natural pollution in Paradise Valley, Colorado - Rodney J Richards (Journal of the Colorado-Wyoming Academy of Science, 1968)

Habitat of Pocket Gophers in Cochetopa Creek Drainage, Colorado - R. F. Beck; Roger Hansen (American Midland Naturalist, 1968)
Comparisons were made between some characteristics of soils and vegetation for sites supporting Thomomys talpoides and for adjacent sites not occupied by these pocket gophers in alpine, subalpine and shrub-grassland habitats in the Cochetopa Creek drainage, Colorado. Different species of bluegrasses (Poa spp.), sedges (Carex spp.), cinquefoils (Potentilla spp.), and bluebells (Mertensia spp.) occurred in the alpine, subalpine, and shrub-grasslands. There were 16 species of plants common to the alpine and subalpine, three species of plants oc- curred in both the subalpine and shrub-grasslands and two species occurred in both the shrub-grasslands and the alpine. Alpine skyrocket (Androsace septentrionalis puberulenta) occurred in all three habitats. Plant composition was very similar between sites occupied by pocket gophers and adjacent unoccupied sites. Those differences detected did not appear great enough to account for the presence or absence of pocket gophers. Soils in the alpine we

Brandon Field, Kiowa County, Colorado - John Stoddard (Mountain Geologist, 1968)
ABSTRACT: Brandon field, first commercial Mississippian oil production in Colorado, located in Kiowa County in southeastcrn Colorado, was discovered in August, 1965. Initial completion was madc in carbonate rocks of the Osagcan Series (Mississlppian) at a depth of 4770 fect. The twentyfour producing wclls drilled to datc have cstablishcd production also from the Mississippian St. Louis. Spergen and Warsaw Formations, covering a stratigraphic interval of 300 fcet. Petroleum is entrappcd in a large anticlinal structurc that shows cvidence of early Palcozoic growth, this anticline now is locatcd along the northeast trending Las Animas arch, which generally is considercd to be a Laramidc fold. Uniquc cxploitation problems are caused by a very low rescrvoir prcssure, heterogencous development of porosity and an extensive fracture system. Cumulative oil production through March 1968 was over 1, 200, 000 barrels.

The Colorado River International Boundary - James E. Hill (Journal of Geography, 1968)

Bayou Salado: The Story of South Park by Virginia McConnell, and: Uncompahgre Country by Wilson Rockwell - Maynard Fox (Western American Literature, 1967)

2,4‐D Herbicide, Vegetation, and Pocket Gopher Relationships Black Mesa, Colorado - Curtis H. Halvorson; Howard P. Tietjen; Paul L. Hegdal; Ancel M. Johnson (Ecology, 1967)
In a 7—year study on Black Mesa, Colorado, elevation 10,000 ft 2,4—D herbicide treatment initially reduced forb abundance and northern pocket gopher (Thomomys talpoides) populations 80% to 90%. Both forbs and pocket gophers remained at low levels on one area but returned to pretreatment levels on the other area. The decline in pocket gopher numbers was caused by an inability to survive where their preferred food (forbs) was eliminated by herbicide treatment. The decline was not caused by movements of the animals from sprayed areas, or by direct or indirect toxicity of 2,4—D. The common grasses offer, at best, only a marginal diet for northern pocket gophers; only succulent grasses or those bearing corms or rhizomes yield a subsistence diet. Limited sampling did not indicate that the spray treatment affected the numbers of other small mammals.

Stratigraphy and Structure of Tertiary Rocks in Central South Park, Park County, Colorado - Efraim Lozano (Mountain Geologist, 1967)
ABSTRACT: Tertiary rocks more than 5,000 feet thick outcrop in central South Park, Colorado; they include continental sediments and volcanics. These rocks have been previously divided into several formations, from youngest to oldest: Denver Formation (Eocene), and lower andesite of the Thirtynine Mile volcanic field, Agate Creek Formation (ash flow-4), and Antero Formation (all of Oligocene age). A newly-recognized unit, the Hatsel Formation, is probably of Pliocene and Pleistocene age. Major unconformities separate Oligocene rocks from older and younger beds. The formations of Oligocene age are separated from each other by minor unconformities. The Denver Formation and older rocks were deformed during the Laramide orogeny. The Oligocene rocks were mildly folded and faulted by later Tertiary deformation in late Oligocene to Miocene time. The main structural features of the area are the Antero and High Creek synclines, and the Santa Maria fault (new name).

Census of a beaver colony - R. T. Paul (1967)

The phenetic relationships of the butterflies. I. Adult taxonomy and the non-specificity hypothesis - A. H. Ehrlich; P. R. Ehrlich (Systematic Zoology, 1967)
The relationships of adult butterflies were evaluated using the techniques of numerical taxonomy and various sets of characters. Using a total of 196 characters of the external and internal anatomy produced phenograms quite similar to the one arrived at by classical taxonomic techniques. There were, however, significant differences (e.g., relatively low similarity of the Papilionidae and Pieridae). Relationships based on most subsets of characters showed a “family resemblance” to one another and to the classical relationships. Relationships based on 96 internal and 100 external characters were compared by a randomization test. When evaluated by correlation coefficients the internal and external relationships were significantly different. When evaluated by distances they were not. Our results in general seem to support a “weak” version of the nonspecificity hypothesis—analysis of different large samples of characters ordinarily will yield positively correlated but non-identical patterns

Helminth Parasites of the Prairie Rattlesnake, Crotalus viridis Rafinesque, 1818, in Weld County, Colorado - Elmer A. Widmer (The Journal of Parasitology, 1967)
The prairie rattlesnake, Crotalus viridis Rafinesque, 1818, is available in large numbers in Weld Co., Colorado, and since virtually no information was available on parasitism of C. viridis, additional studies were made.

Probable existence of synergistic interactions among different species of protozoans - J. Cairns (Revista de Biologia, 1967)

Barriers to gene flow in natural populations of grasshoppers. I. The Black Canyon of the Gunnison River and Arphia conspersa - R. L. Willey (Psyche, 1967)

Baculite Mesa, Pueblo County, Colorado - Lyle E. Nesbitt (Rocks & Minerals, 1967)

Pinus aristata (Pinaceae) in Boulder County, Colorado: Northward Extension of Its Known Colorado Range - Erik K. Bonde (The Southwestern Naturalist, 1967)

A study of the behavior of Eutamias near Gothic, Colorado - L. A. Wheeler (1967)

Jointing in Sedimentary Rocks along the Grand Hogback Monocline, Colorado - Frederick N. Murray (The Journal of Geology, 1967)
Removal of strata dip-and-strike effects at each collecting station by rotation in three-dimensions increases resolution of data concerning the orientation of joint surfaces in sedimentary rocks. Contoured equal-area diagrams of unrotated and rotated joints illustrate the changes in joint plane pole maxima. Jointing in sedimentary rocks upturned along two trends of the Grand Hogback Monocline, Colorado, is inferred as being related to vertical uplift rather than to horizontal compression or superposition of a regional joint system. The joints may have been caused by tensional stresses developed within the strata by the inherent slowness of rocks to relax from a prestressed condition created by deep burial.

Zygospores and spore appendages of Harpella (Trichomycetes) from larvae of Simuliidae - R. W. Lichtwardt (Mycologica, 1967)
Larvae of black flies (Simuliidae) serve as hosts for a number of Trichomycetes. Not infrequently several taxa of these fungi occur simultaneously in individual larvae. The larval hindguts may contain, for instance, species of the genus Paramoebidium (Amoebidiales) to? gether with species of one or more genera of the Genistellaceae (Harpellales), while their midguts frequently harbor Harpella melusinae Leger & Duboscq. This rich representation of Trichomycetes is not unusual in black fly populations in the United States, nor in some species in France (Tuzet and Manier, 1955). The Trichomycetes inhabiting the hindguts of black fly and other Diptera larvae will be the subject of subsequent publications. This paper is concerned with the genus Harpella. Zygospores are documented for the first time as well as structural features of the peculiar appendages borne by the asexual spores.1 Considerable field work with Harpella during the past 6 years has convinced me that the genus, as we now kn

Review: War for the Colorado River, by John Upton Terrell - Norris Hundley (Pacific Historical Review, 1966)
Book Review| May 01 1966 Review: War for the Colorado River, by John Upton Terrell War for the Colorado RiverJohn Upton Terrell Norris Hundley Norris Hundley Search for other works by this author on: This Site PubMed Google Scholar Pacific Historical Review (1966) 35 (2): 236–239. https://doi.org/10.2307/3636690 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Peer Review Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Cite Icon Cite Search Site Citation Norris Hundley; Review: War for the Colorado River, by John Upton Terrell. Pacific Historical Review 1 May 1966; 35 (2): 236–239. doi: https://doi.org/10.2307/3636690 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentPacific Historical Review Search This content is only available via PDF. C

A vegetation study on an earthflow in Gunnison County, Colorado - L. M. Foster (1966)

Mountain mosquitoes of the Gothic, Colorado area - Melvin T. Smith (American Midland Naturalist, 1966)
Mosquito species inhabiting a high mountain area (9000 to 12,000 feet) in south-central Colorado west of the Continental Divide comprised 11 Aedes, 4 Culiseta, 1 Culex, and 3 chaoborines. They can be placed by altitudinal associations in two major groups: 1) mountain species, subdivided into alpine (A. impiger) and subalpine (A. cataphylla, communis, hexodontus, implicatus, and pullatus; Culiseta incidens, impatiens, inornata; probably Aedes fitchii and Culiseta alaskaensis), and 2) valley and foothill species (Aedes cinereus, dorsalis, increpitus, spencerii idahoensis, and Culex tarsalis). Seasonal development, abundance, and species dominance, as shown by four seasons of collecting, are discussed and illustrated by charts; notes on habits of adults and habitats of larvae, with associated species and collection records, are given for each species, along with pertinent taxonomic observations. The origin of the faunal elements represented by the 28 species of the Colorado Rockies is dis

California's Stake in the Colorado River a - D. N. Cole (Groundwater, 1966)
Abstract California has an enormous stake in the Colorado River. In the southern portion of the State, 80 percent of the water used is furnished by the Colorado River, and this area needs still more water in the immediate years ahead. But it cannot get more from the natural supply of the Colorado. The river is already over‐committed, and California in fact may have to cut back on its present take from that source. This is not the Colorado River in Texas; Los Angeles has gone hundreds of miles to get water, but has not reached that far east‐yet.

Food habits of two sympatric Colorado sciurids - W. M. Carleton (Journal of Mammalogy, 1966)
The golden-mantled ground squirrel (Citellus lateralis lateralis) and the least chipmunk (Eutamias minimus consobrinus) were studied in the mountains of west central Colorado where the two species are sympatric and display marked similarities in habitat selection, life cycles and general behavior patterns. Detailed investigation of the energy relationships and food habits of these animals, including field observations, stomach-content analyses and food preference tests, demonstrated a slight divergence in general food preferences and a profound dependence by both species upon the common dandelion (Taraxacum officinale) for summer food. This plant provided more than 80% of the June–August diet of both chipmunk and mantled squirrel. The chipmunk preferred and consumed the flowers, seeds, and seed-laden heads of the dandelion, while the mantled squirrel preferred the stems and rarely ate the heads or seeds. These behavior patterns effectively removed, in part, the two sciurids from direct

The Fremont Butte, Washington Co., Colorado, Meteorite - GLENN I. HUSS; PETER R. BUSEK; CARLETON B. MOORE (Meteoritics, 1966)
Abstract The Fremont Butte meteorite was found near Fremont Butte, Colorado, in 1963. A single individual was found weighing 6.6 kg. It is an olivine‐hypersthene or L group chondrite showing brecciation and a small number of well formed chondrules and olivine phenocrysts.

Dawsonite in the Green River Formation of Colorado - Charles Milton; John Ward Smith (Economic Geology, 1966)
Dawsonite (NaAl (OH) 2 CO 3 ) is relatively abundant (up to 25 percent) as a rock-forming constituent of a zone within the Green River oil shales in the Piceance Creek Basin, Colorado, and also occurs in Pleistocene ash beds, Olduvai Gorge, Tanzania. The mineral is most readily distinguished from other carbonates of the Green River Formation by optical properties and X-ray diffraction. 9In five of the seven known occurrences, the formation of dawsonite has been related to hydrothermal activity connected with volcanic episodes, with varying ore mineralization.9 The Green River and Olduvai Gorge occurrences, however, are ascribed to reaction of carbonate solutions with nepheline of the original sediments.

A comparative study of the macroscopic fauna of small subalpine lakes at Mexican Cut, Colorado - M. Walter (1966)

A study of key characteristics for distinguishing several Drosophila affinis subgroup species, with a description of a new related species - D. D. Miller; R. L. Sulerud (American Midland Naturalist, 1966)
Ralph L. Sulerud, Dwight D. Miller, A Study of Key Characteristics for Distinguishing Several Drosophila affinis Subgroup Species, with a Description of a New Related Species, The American Midland Naturalist, Vol. 75, No. 2 (Apr., 1966), pp. 446-474

A field comparison of two methods of determining the home range of mice - D. H. Wise (1966)

Larval differences between Aedes communis (DeG.) and A. implicatus Vock. (Diptera: Culicidae) in a Colorado community - Melvin T. Smith (Mosquito News, 1965)

Adaptation of heart and lung weight to high altitude in the robin - W. A. Dunson (Condor, 1965)
Journal Article Adaptation of Heart and Lung Weight to High Altitude in the Robin Get access William A. Dunson William A. Dunson Department of Biology, Yale University, New Haven, Connecticut Present address: Department of Zoology, University of Michigan, Ann Arbor, Michigan Search for other works by this author on: Oxford Academic Google Scholar The Condor, Volume 67, Issue 3, 1 May 1965, Pages 215–219, https://doi.org/10.2307/1365399 Published: 01 May 1965

A comparative study of the fine structure of the trophoblast in several hemochorial placentas - A. C. Enders (American Journal of Anatomy, 1965)
AbstractPortions of the labyrinth or villi of placentas from late pregnancy from nine species in four orders of mammals were examined with the electron microscope. Pronounced patterns of layering of the trophoblast were found in these placentas which were all of the hemochorial type. The laboratory rat, laboratory mouse, hamster, and deer mouse have three layers of trophoblast between the maternal blood space and fetal vessels (hemotrichorial), the rabbit two layers (hemodichorial), the guinea pig and chipmunk one layer (labyrinthine hemomonochorial), and the human and armadillo one layer (villous hemomonochorial).The outer layer of trophoblast of the hemotrichorial placentas (the layer next to the maternal blood) is cellular, but the next two layers are apparently syncytial and are closely apposed to one another. The outer layer of the rabbit placenta is syncytial, while the inner layer contains some pockets of cells. In all of the hemomonochorial placentas examined, the continuous la

NON-ANATECTIC MIGMATITES IN GILPIN COUNTY, COLORADO - PAUL D. LOWMAN (Geological Society of America Bulletin, 1965)
Research Article| September 01, 1965 NON-ANATECTIC MIGMATITES IN GILPIN COUNTY, COLORADO PAUL D LOWMAN, JR. PAUL D LOWMAN, JR. NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, GODDARD SPACE FLIGHT CENTER, GREENBELT, MD. Search for other works by this author on: GSW Google Scholar GSA Bulletin (1965) 76 (9): 1061–1064. https://doi.org/10.1130/0016-7606(1965)76[1061:NMIGCC]2.0.CO;2 Article history received: 05 May 1965 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share MailTo Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation PAUL D LOWMAN; NON-ANATECTIC MIGMATITES IN GILPIN COUNTY, COLORADO. GSA Bulletin 1965;; 76 (9): 1061–1064. doi: https://doi.org/10.1130/0016-7606(1965)76[1061:NMIGCC]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGS

Genesis of the White Cloud and Related Pegmatites, South Platte Area, Jefferson County, Colorado - C. VANCE HAYNES (Geological Society of America Bulletin, 1965)
Research Article| April 01, 1965 Genesis of the White Cloud and Related Pegmatites, South Platte Area, Jefferson County, Colorado C VANCE HAYNES, JR. C VANCE HAYNES, JR. Dept. Geology, University of Arizona, Tucson, Ariz. Search for other works by this author on: GSW Google Scholar GSA Bulletin (1965) 76 (4): 441–462. https://doi.org/10.1130/0016-7606(1965)76[441:GOTWCA]2.0.CO;2 Article history received: 19 Mar 1962 rev-recd: 12 May 1964 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Twitter LinkedIn Tools Icon Tools Get Permissions Search Site Citation C VANCE HAYNES; Genesis of the White Cloud and Related Pegmatites, South Platte Area, Jefferson County, Colorado. GSA Bulletin 1965;; 76 (4): 441–462. doi: https://doi.org/10.1130/0016-7606(1965)76[441:GOTWCA]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search in

A preliminary study of Ranunculus inamoenus, alpeophilus and eschscholtzii - Megan L. Porter (1965)

A study of the life cycles of Formica neorufabarbis and Formica fusca - Megan L. Porter (1965)

Vernal behaviour of the yellow-bellied marmot (Marmota flaviventris) - Kenneth B. Armitage (Animal Behaviour, 1965)
The dispersal was associated with changes in home ranges and with the avoidance of dominant animals by subordinate animals, and females moved from being concentrated in the centre of the colony to being more widely dispersed during the vernal period.

Experimental Analysis of the Homing Behavior of White Footed Mice (Genus Peromyscus) - K. S. Rawson; P. H. Hartline (1964)

A comparative hematological study of Peromyscus in Louisiana and Colorado - B. J. Gough; S. S. Kilgore (Journal of Mammalogy, 1964)
Peromyscus gossypinus and Peromyscus nuttalli were collected near Ruston, Louisiana from 1 September 1960 to 1 June 1961. Peromyscus maniculatus was collected near Gothic, Colorado from 1 August 1961 to 20 August 1961 and in the Black Canyon of the Gunnison National Monument from 23 August 1961 to 1 September 1961. Blood was taken from each animal collected and hematological measurements were made. Erythrocyte counts, hemoglobin concentrations and hematocrits were found to be higher for Peromyscus in Colorado than in Louisiana. Leukocyte counts, mean corpuscular volumes and mean corpuscular hemoglobins were higher for Peromyscus in Louisiana than in Colorado. Differences were also observed in the electrophoretic hemoglobin migration patterns between the species while mean corpuscular hemoglobin concentrations were similar in all species. Major hematological differences were found to occur between P. maniculatus at Gothic, Colorado and P. maniculatus at the Black Canyon, Colorado, and b

Social interaction among adults of the grasshopper Arphia conspersa - R. L. Willey (American Zoologist, 1964)

The comparative myology of four dipodoid rodents (Genera Zapus, Napaeozapus, Sisista and Jaculus) - D. Klingener (University of Michigan Museum of Zoology, Miscellaneous Publication, 1964)

The forest resource of Colorado / - Grover A. Choate; Robert L. Miller; Intermountain Forest; Range Experiment Station (Ogden, Utah) (1964)
This report is concerned primarily with the timber resource.However, because practically none of the forest area is managed for timber alone, the report also briefly describes demands for associated forest valueswater, recreation, wildlife, and forage.

Quantitative studies in angiosperm taxonomy. X. Valeriana. XI. Geranium. XII. Mimulus - N. H. Russell (Castanea, 1964)

A recreational use analysis of the National Forest land from Emerald Lake to the Rocky Mountain Biological Laboratory - R. Vaughan (1964)

Axenic culture of two new species of branched Trichomyctes - R. W. Lichtwardt (American Journal of Botany, 1964)
Two new endocommensal fungi belonging to the Genistellaceae (Harpellales) were isolated in pure culture from the hindguts of Diptera larvae: Smittium culesitae from the mosquito Culesita impatiens, on a 10% brain‐heart infusion, and S. simulii from the black fly Simulium argus, on a potato dextrose‐yeast extract medium. Both species appear to have no unusual nutritional or cultural requirements and can grow on synthetic media and a variety of extract media, as can also the other 4 existent isolates of Smittium (Rubetella). Identical isolation methods proved unsuccessful for culturing various other genera of Harpellales and Eccrinales, with the exception of an Enterobryus sp. (from the fiddler crab Uca crenulata)

Evidence for echolocation in shrews - A. Novick; E. Gould; N. C. Negus (Journal of Experimental Zoology, 1964)

"Patterned ground" in south-western Colorado (1963)

A study of Plecoptera in Copper Creek, Gothic, Colorado - M. Walter (1963)

Activity rhythm in Peromyscus: its influence on rates of recovery from Nembutal - W. Kem; S. T. Emlen (Science, 1963)

The exclusion of Colpoda (Ciliata) from superficially favorable habitats - B. Maguire (Ecology, 1963)

An analysis of variation in Viola nephrophylla - F. S. Crosswhite; N. H. Russell (Madro¤o, 1963)

The thoracic and basal abdominal musculature of the butterflies (Lepidoptera: Papilionoidea) - A. H. Ehrlich; P. R. Ehrlich (Microentomology, 1963)

The Colorado River Decision–1963 - Edward W. Clyde (Utah Law Review, 1963)

Some metabolic and nutritive aspects of community structure with particular reference to the role of invertebrates in food chains, food webs, and trophic structure in marine, fresh-water, and terrestr - J. F. Feldman (1963)

Cotton Rat from Kiowa County, Colorado - Roger Hansen (Journal of Mammalogy, 1963)
Journal Article Cotton Rat from Kiowa County, Colorado Get access R. M. Hansen R. M. Hansen Colorado State University Experiment Station, Fort Collins Search for other works by this author on: Oxford Academic Google Scholar Journal of Mammalogy, Volume 44, Issue 1, 20 February 1963, Page 126, https://doi.org/10.2307/1377190 Published: 20 February 1963 Article history Received: 23 February 1962 Published: 20 February 1963

Range extension of Colorado Cyphoderris (Orthoptera: Prophalangopsidae) - R. L. Willey (Entomological News, 1963)

The passive dispersal of small aquatic organisms and their colonization of isolated bodies of water - B. Maguire (Ecological Monographs, 1963)
Little advantage was taken of what was possibly the greatest opportunity in modern times to observe the recolonization of an island, when much of the island was blown into the air and the remainder was covered by many feet of glowing volcanic ash.

Geology of part of the southern Sangre de Cristo Mountains, New Mexico - Jennifer Miller; Patrick K. Sutherland; Angus W. Montgomery (1963)
Precambrian metasedimentary and metaigneous rocks, Paleozoic sedimentary rocks, and Cenozoic sedimentary deposits and igneous rocks are exposed in the Tesuque-Velarde-Tres Ritos-Cowles thirty-minute quadrangle. The mapped area includes the main central and western parts of the southern Sangre de Cristo Mountains in north-central New Mexico and a part of the Rio Grande depression to the west. Precambrian rocks, mostly exposed in the highest ridges as well as the deepest canyons of the mountains, consist of the older, metasedimentary Ortega Formation and the younger, chiefly metaigneous Vadito Formation, both intruded by the Embudo Granite. The Ortega Formation includes a lower 10,000-foot-thick quartzite, overlain by staurolite schist and muscovite-quartz-biotite phyllite, with a distinctive black carbonaceous phyllite at the top. The Vadito Formation, unconformable on the Ortega, contains minor conglomerate near its base, metarhyolite felsites, and minor muscovite-quartz-biotite phylli

Geology of Devonian Type Section (Chaffee Formation), Fremont County, Central Colorado - C. C. REEVES (Geological Society of America Bulletin, 1962)
Research Article| December 01, 1962 Geology of Devonian Type Section (Chaffee Formation), Fremont County, Central Colorado C. C REEVES, JR. C. C REEVES, JR. Dept. Geosciences, Texas Technological College, Lubbock, Texas Search for other works by this author on: GSW Google Scholar GSA Bulletin (1962) 73 (12): 1443–1450. https://doi.org/10.1130/0016-7606(1962)73[1443:GODTSC]2.0.CO;2 Article history received: 03 Oct 1960 first online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation C. C REEVES; Geology of Devonian Type Section (Chaffee Formation), Fremont County, Central Colorado. GSA Bulletin 1962;; 73 (12): 1443–1450. doi: https://doi.org/10.1130/0016-7606(1962)73[1443:GODTSC]2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto sugg

PLANT TOXICANTS IN UNDERGROUND WATER IN ADAMS COUNTY, COLORADO - P. A. U. L. URONE; Erik K. Bonde (Soil Science, 1962)

The petrology and structural geology of the Tolvar Peak area, Gunnison County, Colorado - Carl Leach (Holmes Museum Of Anthropology (Wichita State University), 1962)
Thesis (M.S.)– University of Wichita, College of Liberal Arts and Sciences, Dept. of Geology

The geology and petrography of the Parlin area, Gunnison County, Colorado - Don W. Dalrymple (Holmes Museum Of Anthropology (Wichita State University), 1962)
Thesis (M.S.)– University of Wichita, College of Liberal Arts and Sciences, Dept. of Geology

Feeding Habits of Pocket Gophers on Mountain Grasslands, Black Mesa, Colorado - James O. Keith; A. Lorin Ward (Ecology, 1962)

The Colorado River Basin - Neal D. Houghton (Western Political Quarterly, 1962)

Beaver pond project - J. Pohly; M. Stoerker (1962)

Geophysical case history; Black Hollow field, Weld County, Colorado - E. J. Northwood (Geophysics, 1962)
Abstract The Black Hollow field is located in Weld County, Colorado, on the W. flank of the Denver-Cheyenne Basin. The producing reservoir is the Lyons Sandstone of Permian age. Seismic work was begun in the area in 1944, following up gravity leads resulting from a gravity survey done in 1943. A minor lead resulted, but it was not until 1949 when The California Co. moved in a Western Geophysical crew for additional seismic work that structural closure was recognized. This led to the drilling of a well to test the Lower Cretaceous Dakota and Lakota sands, which were then the major objective. The well was abandoned in 1952. During the next year, interest increased in Permian objectives and the well was re-entered and deepened to the Lyons, thereby becoming the discovery well at Black Hollow. Subsequent development drilling indicated anomalous thickening and stratigraphy on the W. flank which led to more seismic work. Results indicated that this could be mapped. Furtherm

Additional evidence of Rivoli's Hummingbird in Colorado - E. R. Blake (Auk, 1962)

Vegetation and environmental patterns in the Crested Butte area, Gunnison County, Colorado - J. H. Langenheim (Ecological Monographs, 1962)

The head musculature of the butterflies (Lepidoptera: Papilionoidea) - A. H. Ehrlich; P. R. Ehrlich (Microentomology, 1962)

The dichotomous action of Y chromosomes on the expression of position-effect variegation - A. Rein (Genetics, 1962)

Social behaviour of a colony of the yellow-bellied marmot (Marmota flaviventris) - Kenneth B. Armitage (Animal Behaviour, 1962)
It is postulated that agonistic behaviour is one of the factors that limits the number of marmots on a colony site.

Patterns of vegetation of Meridian Lake - E. Smith (1962)

An investigation of the ecology of Mertensia ciliata in Colorado - J. S. Pelton (Ecology, 1961)

Further records of mermithid parasites of mosquito larvae - Melvin T. Smith (Mosquito News, 1961)

Succession of species of protozoa in a last stage pond - G. Leland (1961)

Notes on larval trematodes of Gunnison County, Colorado - D. E. Birkenholz; G. W. Hunter (Transactions of the American Microscopical Society, 1961)

The comparative morphology of the male reproductive system of the butterflies (Lepidoptera: Papilionoidea). I. Some nearctic species - A. H. Ehrlich; P. R. Ehrlich (Microentomology, 1961)

Unusual Abundance of Peromyscus at Gothic, Colorado - Robert H. Catlett; Robert Z. Brown (Journal of Mammalogy, 1961)
Journal Article Unusual Abundance of Peromyscus at Gothic, Colorado Get access Robert H. Catlett, Robert H. Catlett Dept. of Zoology, Univ. of California, Davis Search for other works by this author on: Oxford Academic Google Scholar Robert Z. Brown Robert Z. Brown Dept. of Zoology, Colorado College, Colorado Springs Search for other works by this author on: Oxford Academic Google Scholar Journal of Mammalogy, Volume 42, Issue 3, 21 August 1961, Page 415, https://doi.org/10.2307/1377058 Published: 21 August 1961 Article history Received: 23 January 1961 Published: 21 August 1961

A brief history of the Rocky Mountain Biological Laboratory (The Colorado Magazine, 1961)

Enteric microparasites of amphibians of the Elk Mountains, Colorado - E. Panitz (1961)

Interspecific hybridization and mimicry in butterflies - C. L. Remington (New Scientist, 1960)

Phytoplankton of Lakes of Grand Mesa, Colorado - Claire Norton; L. W. Durrell (Transactions of the American Microscopical Society, 1960)

Wide experimental crosses between Papilio xuthus and other species - C. L. Remington (Journal of the Lepidopterists' Society, 1960)

Studies of schistosomiasis, XIII. Schistosome dermatitis in Colorado - G. W. Hunter (Journal of Parasitology, 1960)

Notes on larval trematodes from snails of Gunnison County, Colorado - D. E. Birkenholz; G. W. Hunter (Journal of Parasitology (Supplement), 1960)

Vegetational succession in subalpine ponds in the Rockies - P. Buck (Proceedings of the Oklahoma Academy of Science, 1960)

Studies on the chromosomes of North American Rhopalocera. I. Papilionidae - K. Maeki; C. L. Remington (Journal of the Lepidopterists' Society, 1960)

Foodplant of Hypaurotis chrysalus (Lycaenidae) in Colorado - C. L. Remington (Journal of the Lepidopterists' Society, 1960)

Studies on the chromosomes of North American Rhopalocera. II. Hersperiidae, Megathymidae, and Pieridae - K. Maeki; C. L. Remington (Journal of the Lepidopterists' Society, 1960)

Patterns of chromosome variability in Drosophila pseudoobscura - E. Terzaghi; D. Knapp (Evolution, 1960)

The behavior of strong and weak centromeres at second anaphase of Drosophila melanogaster - M. Ptashne (Genetics, 1960)

Economics of forage production in the mountain meadow areas of Colorado : a progress report / - Colorado Agricultural Experiment Station.; Elmer C. Hunter; United States. (1959)
OO" 0% {67 O72 78 would be economical to harvest sufficient quantities of hay under the two-cut harvest system, along with one of the following:

SCHOOL SCREENING IN R-l JEFFERSON COUNTY. COLORADO???A BRIEF STATISTICAL REPORT - Otto J. Bcbbcr (Optometry and Vision Science, 1959)

Geology of the uranium deposits in the Cochetopa mining district, Saguache and Gunnison counties, Colorado - Roger C. Malan; Henry W. Ranspot (Economic Geology, 1959)
Vein-type uranium deposits of geologic interest and commercial significance occur in the Cochetopa mining district, Saguache and Gunnison Counties, Colorado. The uranium minerals in these deposits have been precipitated from hypogene solutions probably related to Tertiary igneous activity in the district. Silicification and brecciation of the sedimentary rocks in the Morrison formation and the Dakota sandstone, in and adjacent to fault zones, controlled deposition of uranium minerals from hydrothermal solutions. The most important deposits in the district are at the Gunnison Mining Company's Los Ochos claims where substantial reserves of ore in pipelike and in vertically tabular bodies have been blocked out. Pitchblende, the dominant uranium mineral, is associated with abundant clay and minor amounts of marcasite. As a result of studies carried out in the district, certain pertinent geologic criteria on ore localizing influences have been established. (auth)

Biological notes on Megathymus streckeri in Colorado - C. L. Remington (Lepidopterists' News, 1959)

Development of the Upper Colorado River - Ernest O. Larson (Journal AWWA, 1959)

Variation patterns in four clones of Mertensia ciliata - J. S. Pelton (Madrono, 1959)

A study of hybrids in Colias (Lepidoptera, Pieridae) - S. A. Ae (Evolution, 1959)

Swimmer's Itch" in Colorado. A.S.B - G. W. Hunter (Bulletin, 1959)

Habitats in Copper Creek pool - J. Tollman (1958)

Report on second Ecology field trip (Cumberland Pass) - H. O. Olney (1958)

Semester report on sage communities - A. Ogura (1958)

Report on three series of beaver ponds in the Gothic area - J. Hassler (1958)

Kettle ponds (1958)

Genetics of populations of Lepidoptera - C. L. Remington; C. L. Remington (Proc X Int Congress Ent (Montreal), 1958)

Colorado River Aqueduct System of Southern California - Robert B. Diemer (Journal AWWA, 1958)

Brief report on the beaver pond series - A. Ogura (1958)

Comparative studies of the developmental rates, hibernation, and food plants in North American Colias (Lepidoptera, Pieridae) - S. A. Ae (American Midland Naturalist, 1958)
Shigeru Albert AE, Comparative Studies of Developmental Rates, Hibernation, and Food Plants in North American Colias (Lepidoptera, Pieridae), The American Midland Naturalist, Vol. 60, No. 1 (Jul., 1958), pp. 84-96

An ecological description of a close group of glacial-formed and snow-fed mountain lakes - P. Buck (1958)

A comparative study in microhabitat - W. M. Shephard (1958)

Report on grassland community and kettle holes - K. S. Gill (1958)

The Exploration of the Colorado River - G. J. Butland; John Wesley Powell (The Geographical Journal, 1958)

Report on beaver ponds - K. S. Gill (1958)

The subalpine - J. Hassler (1958)

Report on the trip to Cumberland Pass - A. Ogura (1958)

Report on alpine tundra - J. Hassler (1958)

Report on Gothic Reserve Area Aspen Community, Sage-Brush Community and an Open Slope - K. S. Gill (1958)

Gothic Reserve - A. Ogura (1958)

Growth responses of alpine Potentilla diversifolia and Achillea lanulosa to gibberellic acid - J. S. Pelton (Butler University Botanical Studies, 1958)

Report on fresh-water areas - L. Deutsch (1958)

Kettle ponds - H. O. Olney; A. Ogura (1958)

Report on beaver activity in the Gothic area - H. O. Olney (1958)

Combined reports to cover Englemann spruce forest, immature grassy slope, aspen woods, and sage community - H. O. Olney (1958)

The kettle ponds - J. Hassler (1958)

Jurassic stratigraphy in Elk Mountains, west-central Colorado - R. L. Langenheim (Bulletin of the American Association of Petroleum Geologists, 1957)

A classification of vegetation - H. L. Mason; J. H. Langenheim (Bulletin of the Ecological Society of America, 1957)

ARCHEOLOGY: Archeological Investigations on the Uncompahgre Plateau in West Central Colorado. H. M. Wormington and Robert H. Lister - Jesse D. Jennings (American Anthropologist, 1957)

APPRAISAL OF RIDGWAY AND GUNNISON “TILLITES,” SOUTHWESTERN COLORADO - FRANKLYN B. VAN HOUTEN (Geological Society of America Bulletin, 1957)
Research Article| March 01, 1957 APPRAISAL OF RIDGWAY AND GUNNISON "TILLITES," SOUTHWESTERN COLORADO FRANKLYN B VAN HOUTEN FRANKLYN B VAN HOUTEN PRINCETON UNIVERSITY, PRINCETON, N. J. Search for other works by this author on: GSW Google Scholar Author and Article Information FRANKLYN B VAN HOUTEN PRINCETON UNIVERSITY, PRINCETON, N. J. Publisher: Geological Society of America Received: 24 Oct 1956 First Online: 02 Mar 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Copyright © 1957, The Geological Society of America, Inc. Copyright is not claimed on any material prepared by U.S. government employees within the scope of their employment. GSA Bulletin (1957) 68 (3): 383–388. https://doi.org/10.1130/0016-7606(1957)68[383:AORAGT]2.0.CO;2 Article history Received: 24 Oct 1956 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation FRANKLYN B VAN HOUTEN; APPRAISAL OF RIDGWAY AND GUNNISON "TIL

The systematics and evolution of Townsendia (Compositae) - J. H. Beaman (Harvard University, Gray Herbarium, Contributions, 1957)

Evidence of introgressive hybridization and mutation in certain Colorado populations of Aquilegia - J. S. Pelton (Proceedings of the Indiana Academy of Science, 1957)

The Wilson Creek Field, Rio Blanco County, Colorado - J.B. Ladd (Journal of Petroleum Technology, 1957)
Abstract The Wilson Creek field is situated in mountainous terrain of Rio Blanco County, Colo. It was discovered in early 1938 and produces from both the Morrison and Sundance sands of Jurassic age. The underlying Sundance reservoir is fully developed with 18 wells; no dry holes have been drilled. The overlying Morrison reservoir of greater areal extent is almost completely developed with 21 producing wells and three dry holes around the periphery of the field; in addition, all or most of the 18 inside Sundance wells will eventually serve to exploit the central portion of the Morrison reservoir. The Morrison reservoir was moderately undersaturated with an initial average pressure of 2,180 psig and a bubble point pressure of about 1,100 psig; a partial water drive is in effect. A top structure gas injection program was started early in the life of the pool, resulting in a dampened pressure decline rate and increased oil recovery. The

Archaeological Investigations on the Uncompahgre Plateau in West Central Colorado. H.M. Wormington and Robert H. Lister. Proceedings, No. 2, Denver Museum of Natural History Denver, 1956. xiv + 129 pp., 69 figs., 3 tables. $2.50. - John B. Rinaldo (American Antiquity, 1957)
Archaeological Investigations on the Uncompahgre Plateau in West Central Colorado. H.M. Wormington and Robert H. Lister. Proceedings, No. 2, Denver Museum of Natural History Denver, 1956. xiv + 129 pp., 69 figs., 3 tables. $2.50. - Volume 22 Issue 3

Radioactive ages of minerals from the Brown Derby Mine and the Quartz Creek Granite Near Gunnison, Colorado - L. T. Aldrich; G. L. Davis; G. R. Tilton; G. W. Wetherill (Journal of Geophysical Research, 1956)
Radioactive age determinations have been made on 16 minerals from the Brown Derby pegmatite and the Quartz Creek granite. A high degree of consistency has been found among the Rb-Sr ages measured on micas and feldspars. A similar degree of consistency exists in the K-A ages of micas. These consistencies are indicative of the usefulness of measurements of the decay of K40 and Rb87 in determining relative ages of igneous rocks. U-Pb and Th-Pb ages determined from minerals obtained from the pegmatite and granite were not concordant. Different minerals showed different types of partial separation of parent and daughter elements. Comparisons of Rb-Sr and K-A ages with concordant U-Pb ages have been made on other pegmatites. The measurements are most consistent with an age of 1350±100 m.y. for the pegmatite and the granite.

Duttonite, New Vanadium Mineral from Peanut Mine, Montrose County, Colorado - Robert Meyrowitz; Carl H. Roach; Michael L. Thompson (Science, 1956)

A study of seed dormancy in 18 species of high altitude Colorado plants - J. S. Pelton (Butler University Botanical Studies, 1956)

Archaeological investigations on the Uncompahgre Plateau in West Central Colorado - Robert H. Lister; H. M. Wormington (Medical Entomology and Zoology, 1956)

Forecasting Summertime Shower Activity at Grand Junction, Colorado - Woodrow W. Dickey (Bulletin of the American Meteorological Society, 1956)
Due to the lack of a dense network of reporting stations in the Grand Junction, Colorado area and the inadequate representation of shower activity by observations of rain at a single rain gage, certain arbitrary criteria were set up to define a “shower” day at Grand Junction. Relationships of a number of meteorological variables to shower activity were determined and the four variables which showed the strongest relationships were combined graphically to form an objective forecast aid for determining the probability of shower activity at Grand Junction during the 18-hour period 1130MST to 0530MST. Tests on independent data confirm the relationship found in the developmental data.

Plant succession on a subalpine earthflow in Colorado - J. H. Langenheim (Ecology, 1956)
The statistical concept of home range as applied to the recapture radius of the deer-mouse (Peromyscus) and the calculation of homerange and density of small mammals is presented.

Colorado Butterflies - F. M. Brown (1956)

Genetics of populations of Lepidoptera (Proceedings of the Tenth International Congress of Entomology, 1956)

Survey of the Gothic Natural Area - H. A. McCullough (The Scientific Monthly, 1956)