Abstract: Middle Cretaceous Rocks of Mexico and Texas

Keith Young

Middle Cretaceous (late Albian to Turonian) rocks in Texas are mostly terrigenous or nodular and micritic. In Mexico, the terrigenous deposits are replaced by limestones which, in turn, are more reefoid to the south than they are in the north. Southward in Jalisco and Colima there are many reefoid outcrops; eastward into Queretaro and Guerrero, similar rocks intertongue with marlstones and terrigenous rocks.

The Belton high, San Marcos platform, Del Carmen trend, Sierra de la Parra, Coahuila Peninsula, and Miquihuana platform all contributed to facies changes around their margins and to the thinning of nonreefoid rocks over these structurally higher areas.