PERMIAN BRACHIOPODA FROM FAR WEST TEXAS AND SOUTHWESTERN NEW MEXICO (BIOSTRATIGRAPHY, PALEOBIOGEOGRAPHY, UNITED STATES)
Abstract
A detailed analysis of the stratigraphic and geographic distribution of Permian brachiopods in far west Texas and southwestern New Mexico has been accomplished through the collection, extraction, and description of the taxa. The Permian strata and faunules examined are from the Hueco and Franklin mountain ranges of Hudspeth and El Paso counties, Texas and Otero and Dona Ana counties, New Mexico; the Jarilla, Organ, Dona Ana, Robledo, Florida, Tres Hermanas, Big Hatchet, and Animas mountain ranges of Otero, Dona Ana, Luna, and Hidalgo counties, New Mexico. The Hueco Mountains are approximately 56 kilometers (35 miles) east of El Paso, Texas. The Permian strata of this range consist of a pre-Hueco Permian unit and the Hueco Group. The Hueco Group brachiopod faunas may be allocated to three formations of the group (in ascending order): Hueco Canyon Formation, 30 genera and 32 species; Cerro Alto Formation, 14 genera and 16 species; and Alacran Mountain Formation, 18 genera and 20 species. The Franklin Mountains are located in the extreme western tip of Texas and extend northward into south-central New Mexico. The brachiopods of the Permian strata of the range occur in the Hueco Group, which is subdivided into three formations (in ascending order): Hueco Canyon Formation, 25 genera and 29 species; Cerro Alto Formation, 10 genera and 10 species; and Alacran Mountain Formation, 25 genera and 25 species. The Jarilla Mountains are approximately 1.6 kilometers (1 mile) north of Orogrande, New Mexico. The Permian strata of this range include the Laborcita and Hueco formations. The Hueco Formation contains 10 genera and 10 species of brachiopods. The Organ Mountains are approximately 14 kilometers (9 miles) east of Las Cruces, New Mexico. The Permian strata of this range are included in the Hueco Formation, which contains 6 genera and 6 species of brachiopods. The Dona Ana Mountains lie approximately 16 kilometers (10 miles) north of Las Cruces, New Mexico. The Permian strata of this range are assigned to the Hueco Formation, which contains 7 genera and 7 species of brachiopods. The Robledo Mountains, which lie approximately 24 kilometers (15 miles) northwest of Las Cruces, New Mexico, also contain outcrops of Permian strata that have been assigned to the Hueco Formation. The Hueco Formation of this range has yielded 11 genera and 11 species of brachiopods. The Florida Mountains are approximately 14 kilometers (9 miles) southeast of Deming, New Mexico. The Permian Hueco Formation of this range contains 5 genera and 5 species of brachiopods. . . . (Author's abstract exceeds stipulated maximum length. Discontinued here with permission of author.) UMI
Subject Area
Paleontology
Recommended Citation
SIMPSON, RONALD DE, "PERMIAN BRACHIOPODA FROM FAR WEST TEXAS AND SOUTHWESTERN NEW MEXICO (BIOSTRATIGRAPHY, PALEOBIOGEOGRAPHY, UNITED STATES)" (1984). ETD Collection for University of Texas, El Paso. AAI8420095.
https://scholarworks.utep.edu/dissertations/AAI8420095