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First report of Gogia (Eocrinoidea, Echinodermata) from the Early-Middle Cambrian of Sonora (Mexico), with biostratigraphical and palaeoecological comments |
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| Authors: | Elise Nardin Emilio Almazán-Vásquez |
| Institution: | a Sciences de la terre, UMR CNRS 5561 biogéosciences, université de Bourgogne, 6, boulevard Gabriel, 21000 Dijon, France b Universidad de Sonora, Departamento de Geología, Boulevard Luis Encinas y Rosales 83000, Hermosillo, Sonora, Mexico c Universidad Nacional Autónoma de Mexico, Instituto de Geología, Departamento de Paleontología, Ciudad Universitaria, Delegación Coyoacán, 14510, Mexico |
| Abstract: | The blastozoan echinoderm genus Gogia is reported for the first time in the Early and the Middle Cambrian of Mexico. Reports in different members of the section of San José de Gracia (Sonora State, northwestern Mexico) extend the palaeogeographical range of the genus to the South Laurentia, and the stratigraphic range of Gogia granulosa to the whole first half of middle Middle Cambrian. Isolated plates occur in rocks deposited in detrital inner platform and complete specimens, in carbonate outer platform, confirming their ability to live in diverse environments. Their presence in these different environments through the Early-Middle Cambrian on Laurentia agrees with the onshore-offshore expansion of echinoderms during Cambrian. |
| Keywords: | Stratigraphy Echinodermata Blastozoa Gogia Palaeoecology Middle Cambrian Mexico |
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