Palaeoecological significance of turritelline gastropod-dominated assemblages from the mid-Cretaceous (Albian-Cenomanian) of Texas and Oklahoma,USA |
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| Institution: | 1. Paleontological Research Institution, 1259 Trumansburg Road, Ithaca, NY 14850, USA;2. Department of Earth and Planetary Sciences and Botanical Museum, Harvard University, Cambridge, MA 02138, USA;1. Department of Earth Sciences, The University of Hong Kong, Hong Kong, China;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing 210008, China;3. Institut de Systématique, Évolution, Biodiversité, ISYEB-UMR 7205-CNRS, MNHN, UPMC, EPHE, Muséum national d''Histoire naturelle, Sorbonne Universités, 57 rue Cuvier, CP 50, Entomologie, F-75005, Paris, France;4. Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, 1, Beichen West Road, Beijing 100101, China;5. Department of Earth Sciences, The Natural History Museum, London SW7 5BD, UK;1. State Key Laboratory of Biogeology and Environmental Geology, China University of Geosciences (Beijing), Xueyuan Lu 29, Haidian District, Beijing, 100083, PR China;2. State Key Laboratory of Palaeobiology and Stratigraphy, Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, 39 East Beijing Road, Nanjing, Jiangsu 210008, PR China;3. Exploration and Development Research Institute of Daqing Oil Field Corporation, Daqing, Heilongjiang 163712, PR China;4. Universidade de Brasília, Instituto de Geociências, Campus Universitário Darcy Ribeiro, Brasília, DF CEP 70.910-900, Brazil;5. Guangzhou Marine Geological Survey, Guangzhou 510075, PR China;1. Department of Earth and Univers Sciences, University of Tlemcen, B.O. Box 119, Tlemcen, Algeria;2. Departamento de Geología, Universidad de Jaén, 23071 Jaén, Spain;3. Geozentrum Nordbayern, Friedrich Alexander Universität Erlangen-Nürnberg, 91054 Nürnberg, Germany;4. MARE-Departmento de Ciências da Terra, Universidade de Coimbra, 3000-272 Coimbra, Portugal |
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| Abstract: | The faunas of three previously poorly known and highly fossiliferous limestones from the upper Lower Cretaceous of Texas are dominated by turritelline gastropods. These faunas consist of turritelline-dominated assemblages in the Whitestone Limestone Member of the Walnut Formation in Travis County (middle Albian), the Keys Valley Marl Member of the Walnut Formation in Coryell County (middle Albian), and the Fort Terrett Formation in Kimble County (middle Albian). A fourth high-spired gastropod assemblage in the Segovia Formation in Pecos County (upper Albian) is not dominated by turritellines. Two other turritelline-dominated assemblages in non-carbonate rocks from the Albian and Cenomanian of Texas and Oklahoma are also described. These turritelline-dominated assemblage occurrences add considerably to our knowledge of the facies occurrence of Cretaceous turritelline-dominated assemblages, and they are consistent with the global facies distribution of these assemblages: i.e., although they are widespread in siliciclastic facies from Cretaceous to Recent, turritelline-dominated assemblages in carbonate facies occur almost exclusively in the Cretaceous and Paleogene. |
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