Microfacies of the middle and upper Cretaceous from the Sierra de Chiapas (SE Mexico)

Based on the micropaleontologic study of the carbonate rocks from the Sierra de Chiapas (SE Mexico) ten microfacies are recognized. They correspond mainly to shallow carbonates with some deeper environments toward the top of the sequence. The age of the strata ranges from Cenomanian to Maastrichtian, including some gaps such as that corresponding to subaereal exposure in Cenomanian times and that for Santonian-Early Campanian which represents a regional discontinuit