Abstract
The present research approaches the precise palaeoecologic interpretation based on the recognition of 12 ‘autochthonous’ bivalve assemblages among 52 registered from the Upper Jurassic–Lowermost Cretaceous La Caja Formation in the Cañón de San Matías section (Mexican Altiplano). Fine-grained deposits together with the near-exclusive record of suspension-feeders are considered the evidence for low-energy and nutrient-rich environments. The presence of oxygen-dependent bivalves, mainly Buchia and Lucina, supports the interpretation of oxygenation as a major factor controlling ecology and therefore the composition of the ‘autochthonous’ bivalve assemblages studied. Significant changes in the composition of bivalve assemblages show no relation between fluctuations in ecological factors and background depositional conditions.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
