Aptian (lower Cretaceous) ammonite biostratigraphy of the Francisco Zarco Dam stratigraphic section (Durango State,northeast Mexico) |
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| Institution: | 1. Instituto de Geología, Universidad Nacional Autónoma de México, Ciudad Universitaria, Coyoacán, 04510 México, D.F., Mexico;2. Departamento de Estratigrafía y Paleontología, Facultad de Ciencias, Universidad de Granada, Avenida Fuentenueva s/n, 18002 Granada, Spain;3. FRE CNRS 2761, Géologie des Systèmes Carbonatés, Université de Provence, F-13331 Marseille Cedex, France;1. Universidad Nacional Autónoma de México, Instituto de Geología, Estación Regional del Noroeste, Hermosillo, Sonora 83000, Mexico;2. Universidad Nacional Autónoma de México, Centro de Geociencias, Campus Juriquilla, Querétaro, Qro. 76230, Mexico;1. CEREGE, Aix-Marseille University, Centre Saint-Charles, 13331 Marseille Cedex 03, France;2. Terra Ignota, Heritage and Geosciences Consulting, Dr. Cádiz 726, Ñuñoa, Santiago, Chile;1. Asian School of the Environment, 62 Nanyang Drive, 637459, Singapore;2. Denningerstr. 46, D-81679, München, Germany;3. Department of Geology and Center for Integrated Geological Studies, Babe?-Bolyai University, Str. M. Kog?lniceanu 1, 400084, Cluj-Napoca, Romania;1. Groupement d''Intérêt Paléontologique, Science et Exposition, 35 Impasse lieutenant Daumas, 83100, Toulon, France;2. Badley Ashton, Reservoir Geoscience Consultancy, Winceby House, Winceby, Horncastle, Lincolnshire, LN9 6PB, United Kingdom;3. Aix Marseille Université, place Victor Hugo, Marseille, cedex 03, 13331, France;4. Chaire TOTAL-AMIDEX, France;5. TOTAL S.A., Centre Scientifique et Technique Jean Féger, Avenue Larribau, 64018, Pau, France;6. Univ. Lyon, Université Claude Bernard Lyon I, ENS de Lyon, CNRS, UMR5276, LGL-TPE, F-69622, Villeurbanne, France;1. Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Hermosillo, Sonora 83000, Mexico;2. School of Earth and Environmental Sciences, Seoul National University, Seoul 151-747, South Korea;3. Geosciences Department, University of Tulsa and Precision Stratigraphy Associates, 149 West Ridge Road, Cleveland, OK 74020-5037, USA;4. Department of Earth Sciences, University of Oxford, South Parks Road, Oxford OX1 3AN, United Kingdom;5. Posgrado en Ciencias de la Tierra, Estación Regional del Noroeste, Instituto de Geología, Universidad Nacional Autónoma de México, Hermosillo, Sonora 83000, Mexico;6. Department of Geology, School of Earth and Atmospheric Sciences, University of Madras, Guindy Campus, Chennai 600 025, India |
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| Abstract: | This work deals with the study of the ammonoid record of a classical stratigraphic section of Aptian age, the Francisco Zarco Dam (Durango State, northeast Mexico). A detailed biostratigraphical analysis considered 1281 specimens systematically sampled on a bed-by-bed basis. Taphonomy, taxonomic composition and paleocology of the studied assemblage, were also stressed. We formally propose an ammonite zonation for this section, which consists of two interval zones, Dufrenoyia justinae and Gargasiceras? adkinsi, one taxon range zone Caseyella aguilerae, and one biohorizon Huastecoceras trispinosoides. Among those biostratigraphic units, three are of new definition. Another topic discussed herein concerns to the problematic definition of the Lower-Upper Aptian boundary using the first stratigraphical appearance of the genus Epicheloniceras. From a paleoecological point of view, we recognized the ammonoid assemblage of the Francisco Zarco Dam section, to be representative of a distal platform environment. Finally, we compared the zonation built for this section with that considered the standard zonation for the Tethyan Domain, concluding that the differences are so substantial that an independent zonation for the Central Atlantic is necessary. |
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