Part I: The Wolfcampian Joyita uplift in central New Mexico: Part II: Fusulinids of the Joyita Hills, Socorro County, central New Mexico

Abstract

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-conglomerates, late Desmoinesian, Missourian, or early Virgilian times. derived from Pennsylvanian limestones and Precambrian As the early Wolfcampian Bursum facies, bearing a granite gneiss of southern Joyita Hills area, unconformably Schwagerina and Triticites fauna, is unconformably on Virgilian truncate southwestward, in order, Missourian, Desmoinesian, beds in many parts of central New Mexico, the Joyita uplift Atokan, and Precambrian rocks. In southern Joyita Hills, is a documented key to this late Virgilian and early Bursum strata abut against remnant hills of Precambrian Wolfcampian episode of erosion and of accompanying de- granite gneiss. These hills were buried by basal Abo red beds position of elastic strata.

Local Knowledge Graph (27 entities)

Related Works

Items connected by shared entities, co-authorship, citations, or semantic similarity.