Datos preliminares sobre el megabentos de bivalvos del Jurásico Superior - Cretácico basal en el Cañón de San Matías (Zacatecas, México).
- Autores: A. de la Mora, Federico Olóriz Sáez, Celestina González Arreola
- Localización: Geogaceta, ISSN 0213-683X, Nº. 26, 1999, págs. 19-22
- Idioma: español
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Resumen
The present contribution shows the first approach to the interpretation of precise stratigraphic horizons containing megabenthic fossil assemblages made of Upper jurassic - lowermost Cretaceous bivalves in México. This is a preliminary report focused on the careful analysis of taphonomic features in bivalve assemblages based on the taxonomic identification of bed-by-bed sampled specimens, On a total sample of fifty-one bivalve assemblages, we interpreted their usual character of parautochthonous assemblages deposited on shallow fine-grained to midd/e-outer she/ves. In addition, no cases of taphonomic condensation were recognised, but stratigraphic horizonsshowing mixing ec%gica/leve/s, usual/y, revealed biostratinomic reworking of originally tiered bivalve assemblages.
