Fossil Record 18(2): 81-104, doi: 10.5194/fr-18-81-2015
Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA
expand article infoA. L. Titus‡, D. Korn§, J. E. Harrell|, L. L. Lambert
‡ Grand Staircase–Escalante National Monument, 669 S. Highway 89A, Kanab, UT 84741, United States of America§ Institut des Sciences de l'Evolution, Université Montpellier II, 34095 Montpellier, France| Noble Energy Inc., Houston, TX 77070, United States of America¶ Department of Geological Sciences, The University of Texas at San Antonio, One UTSA Circle, San Antonio, TX 78249, United States of America
© A. L. Titus, D. Korn, J. E. Harrell, L. L. Lambert.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation: Titus AL, Korn D, Harrell JE, Lambert LL (2015) Late Viséan (late Mississippian) ammonoids from the Barnett Shale, Sierra Diablo Escarpment, Culberson County, Texas, USA. Fossil Record 18(2): 81-104. https://doi.org/10.5194/fr-18-81-2015
Open Access
Abstract
Mid-Carboniferous strata of the Barnett Shale in the Sierra Diablo region are deep water, offshore sediments deposited in the Marathon ForelandBasin. These strata contain a remarkably complete ammonoid record spanningfrom the Late Viséan to the middle Atokan (Moscovian). Late Viséanstrata are referred to as the "Folks Member" of the Barnett Shale and locallyyield numerous ammonoids. Three assemblages can be recognized, which contain,from oldest to youngest, Goniatites eganensis andGirtyoceras hamiltonense (Goniatites eganensis Zone),Goniatites multiliratus and Girtyoceras meslerianum (Goniatites multiliratus Zone), andChoctawites cumminsi and Pachylyroceras cloudi (Choctawitescumminsi Zone). We erect the new genera Choctawites and Uralyroceras to accommodate, respectively, the North American species"Goniatites choctawensis Shumard, 1863", "G. kentuckiensisMiller, 1889" and "G. cumminsi Hyatt, 1893", and Uralian speciesformerly attributed to Pachylyroceras. For the material of"Pachylyroceras cloudi" of the South Urals, the new species nameUralyroceras arquatum is proposed.