"Mexican Geology. Carboniferous (Cant and Permian) in Coahuila and Nuevo Leon (Foage and Hues from privately printed 1854 Philadelphia). Also on borders of Mexico and Guatemala; in Nicaragua with underlying Permian and un- derlying Silurian and Devonian (Crawford 1890, Ann. Set. VI) Cretaceous. Shifor level in Central Mexico 10,000 ft. [Dono]. Triassic type in Sonora (Menthy 1876), Puebla and Oaxaca (Gquidera-Ordony 1893). Menthy collects M-Cordaria plants. Jurassic. "Smaller Jurassic areas are laid down in Castillo's geologic map of Mexico, in the states of Sonora, Coahuila, San Luis Potosi, Gueretaro, Hidalgo, Puebla, and others near the eastern border of the great central plateau, and also in Colima near the coast. The beds, according to Gquidera and Ordony (1893), contain Goncellae, and Communities of the genus Perisphinctes, and pass conformably into the overlying Cretaceous." [Dano]. Lower Cretaceous. "The Lower Cretaceous, on the map of Castillo (1891), extends nearly to the