Response of the western proto-North Atlantic margin to the early Aptian Oceanic Anoxic Event (OAE) 1a: an example from the Cupido platform margin
-Gulf of Mexico, NE Mexico
"Integrated microfacies and geochemical analyses conducted on five stratigraphic sections in northeastern Mexico (ancentral western margin of the proto-North Atlantic) reveal major paleoenvironmental changes in shallow water and pelagic environments in the prelude and run-up of the early Aptian oceanic anoxic event (OAE) 1a. During the Barremian–Aptian transition, the replacement of photozoan rudist-coral by mesotrophic/eutrophic orbitolinid-miliolid communities in the Cupido platform occurred in association with increased nutrient input. [...]"
Source: Cretaceous Research
Authors: Fernando Núñez-Useche et al.