In the southern part of the State of Puebla, central Mexico, the town of Tepexi de Rodriguez is a well-known fossiliferous area because of the beautiful and extraordinary Early Cretaceous vertebrates recovered from the Tlayua Quarry (Applegate, 1996; Espinosa-Arrubarrena and Applegate, 1996; Reynoso-Rosales, 1996a, 1996b, 1997, among others), and a Tertiary plant locality known as “Los Ahuehuetes” (Magallón-Puebla and Cevallos-Ferriz, 1994; Velasco de León and Cevallos-Ferriz, 1997; Ramírez-Garduño, 1998, among others). The Axamilpa river drains this area and along its banks a sequence of Late Cenozoic sands, silts, and gravels are exposed....

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