1914] Dickerson: Fauna of the Martinez Eocene of California 101 



from a sea cliff buried in the sands of the beach of that time. This 

 evidence seems to lend support to the interpretation of an uncon- 

 formity rather than a fault as the best explanation of the relations 

 of the second and third beds. 



The fossils were found in the lower portion of (3), the coarse 

 sandstone and conglomerate described above. The matrix, a coarse 

 sandstone, does not preserve the details of the fossils well. The rock 

 is exceedingly friable and, although shell impressions are abundant, 

 it is difficult to discern even the generic characters. 



Below is a list of the fauna from these beds: 



Flabellum, sp. 



ParacyathusC?), sp. 



Cidaris, sp. 



Terebratulina cf. tejonensis Stan- 

 ton 



Cardium cf. cooperi Gabb 



Cucullaea cf. mathewsonii Gabb 



Dosinia cf . lawsoni, n. sp. 



Glycimeris, sp. 



Glycimeris cf. veatchii var. major 

 Stanton 



Macrocallista (?) packi, n. sp. 



Meretrix stantoni, n. sp. 



Modiolus cf. bakeri, n. sp. 



Ostrea buwaldana, n. sp. 



Phacoides diaboli, n. sp. 



Phacoides quadrata, n. sp. 



Semele(?), sp. 



Tapes(?) quadrata Gabb 



Teredo, sp. 



Venus (?), sp. 



Venericardia, sp. 



Amauropsis(?), sp. 



Alaria, sp. 



Chlorostoma(?), sp. 



Cylichna costata Gabb 



Dentalium, sp. striated 



Dentalium cooperi Gabb 



Discohelix, sp. 



Fissurella, sp. 



Galerus excentricus Gabb 



Hipponyx, sp. 



Natica, sp., a 



Natica (?) sp., fc, spiral lined 



Patella, sp. 



Einginella cf. pinguis Gabb 



Spiroglyphus(?), sp. 



Tritonium martinezensis, n. sp. 



Tritonium, sp., a 



Turritella, sp. 



Turritella cf. pachecoensis Stanton 



Urosyca cf. caudata Gabb 



Crustacean fragments 



Nearly all the genera represented occur in the Martinez Group 

 and one, Uroscyca, appears to be restricted to it. 



Macrocallista(f) packi, n. sp., Meretrix stantoni, n. sp., Modiolus 

 bakeri, n. sp., Phacoides quadrata, n. sp., Cidaris, sp., Tritonium mar- 

 tinezensis, n. sp., Urosyca caudata, Galerus excentricus, Cylichna 

 costata, and Dentalium cooperi occur in the basal Martinez north of 

 Mount Diablo or in the Martinez of Lower Lake. Of these the first 

 seven are characteristically Martinez, the last four range upward into 

 the Tejon, and the last two downward into the Chico. Several of the 

 others listed appear to be close to Martinez forms, but they are too 

 poorly preserved to be specifically determined. Several of these species 

 are new, but none of them represent characteristically Cretaceous 



