1. Allison EC (1955) Middle Cretaceous Gastropoda from Baja California, Mexico. J Paleontol 29:400?432
2. Beggs JM (1983) Stratigraphy, petrology, and tectonic setting of the Alisitos Group, Baja California, Mexico [unpub PhD diss]. U Calif Santa Barbara, pp 1?201
3. Brooks ER, Wood MM, Garbutt PL (1982) Origin and metamorphism of peperite and associated rocks in the Devonian Elwell Formation, northern Sierra Nevada, California. Geol Soc Am Bull 93:1208?1231
4. Fisher RV, Schmincke H-U (1984) Pyroclastic Rocks. Springer Berlin Heidelberg New York Tokyo pp 1?472
5. Gastil G, Phillips PR, Allison EC (1975) Reconnaisance geology of the State of Baja California. Geol Soc Am Mem 140, pp 1?170