Datos preliminares sobre el megabentos de bivalvos del Jurásico Superior - Cretácico basal en el Cañón de San Matías (Zacatecas, México).
- Mora, A. de la
- Olóriz Sáez, Federico
- González Arreola, Celestina
ISSN: 0213-683X
Année de publication: 1999
Número: 26
Pages: 19-22
Type: Article
D'autres publications dans: Geogaceta
Résumé
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.