I examined the utility of the strontium isotope (87Sr/86Sr) ratio in fish otoliths to determine the origins and movements of invasive piscivores in the Upper Colorado River Basin (UCRB). My goal was to determine if invasive piscivores entered riverine habitat of endangered fishes in the UCRB by esca

The lure of gold in the great reefs of Johannesburg near the end of the 19th century not only attracted the famous mining barons such as Cecil John Rhodes, Alfred Beit and Barney Barnato: working men also came from far and wide to feed their families with their labour.Among them was my great-grandfa

PORTION of Colorado better deserves the title of "The Switzerland of America" than the mountain areas in the Uncompahgre National Forest. Here is a region of high and rugged peaks, deep, rock-walled canyons, great plateaus, and green valleys. Excellent fishing, delightful camping sites, and an endle

Siliciclastic sediments of the Proterozoic Uncompahgre Group can be subdivided into stratigraphic units of quartzite (Q) and pelite (P); these units include a basal, fining- and thinning-upward retrogradational sequence (Q1-P1) that records the transition from an alluvial to a shallow-marine setting

Nutrients play fundamental roles in biological systems, affecting plant growth and

The Central Colorado Trough formed as a result of the uplift of the Ancestral Rocky Mountains. With uplift, sediments were eroded from the adjacent highlands and deposited in the trough. The Lower Pennsylvanian stratigraphy of the Central Colorado Trough was determined based on outcrops in the south

Over thirty-five minerals have been identified in the Green River formation of the Piceance Creek Basin, using quantitative X-Ray Diffraction (XRD) bulk analysis.Fifteen major phases occur at over 5 wt% average in 117 samples spanning the thickness of the formation.Integrated data from cores, outcro

Ecosystem Responses to Warming-Induced Plant Species Loss and Increased Nitrogen

The BLM has adopted a two-phase procedure for the integration of geological, energy and minerals (GEM) resources data for suitable/nonsuitable decisions for wilderness study areas (WSA's).

The Niobrara Formation of the Denver Basin is an unconventional oil and gas drilling target composed of alternating chalk and marl units.These units act as the source, seal and trap for hydrocarbons generated in the organic rich marl beds of the Niobrara.Organic geochemical data, such as oil-to-sour

Upper Triassic continental ëtrata of the Chinle Formation, in the Nacimiento Mountains, New Mexico, represent two cycles of fluvial to fluvial-deltaic to marshland-lacustrine sedimentation. Each cycle was initiated by uplift in the southern Ancestral Rocky Mountains and deposited on the local palaeo

Gabbroic dyke and syenitic plug intrusives have been sampled and studied across Huerfano Butte. Petrography and geochemical analyses were performed on selected specimens; from these analyses chemical variation diagrams have been prepared. Crystal Size Distribution analyses have been done on magnetit