Journal
GEOBIOS
Volume 42, Issue 2, Pages 233-242Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.geobios.2008.10.003
Keywords
Stratigraphy; Echinodermata; Blastozoa; Gogia; Palaeoecology; Middle Cambrian; Mexico
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Funding
- UMR CNRS 5561 Biogeosciences (universite de Bourgogne, France)
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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 Jose 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. (C) 2009 Elsevier Masson SAS. All rights reserved.
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