BioStor
 | New and characteristic species of fossil mollusks from the oil-bearing Tertiary formations of southern California Ralph Arnold (1907) Proceedings of The United States National Museum 32: 525-546 |
 | Climatic relations of the Tertiary and Quaternary faunas of the California Region James Perrin Smith (1919) Proceedings of the California Academy of Sciences 9: 123-173 |
 | Some new species from the Pliocene of Southern California with a few changes in nomenclature (1925) Bulletin of The Southern California Academy of Sciences 24: 31-35 |
 | Pliocene deposits north of Simi Valley, California W P Woodring (1930) Proceedings of the California Academy of Sciences 19: 57-64 |