ABSTRACTS AND DISCUSSIONS OF PAPERS 173 



about 3,000 feet of fossiliferous slates, graywackes, and conglomerates hav- 

 ing a nearly vertical dip. The most common fossil forms obtained from these 

 beds include a number of cephalopods, species of Monotis, HaloMa, Mytilus 

 problcmaticus, Gyphcea, and Pinna, besides several new species. A reptile, 

 possibly representing an Ichthyosaur, was also found. The occurrence of a 

 Trigonia within the Triassic of this island of a form comparable to a Jurassic 

 species of Europe suggests that this general region was the center of distribu- 

 tion of that form, and that it later migrated to Europe. 



Discussion 



Dr. J. P. Smith suggested that the form referred to Monotis might prove 

 on further study to be a closely related form, for Monotis is not known to 

 occur with Halobia in either Europe or America. 



FAUNA OF THE TEJON GROUP IN THE CANTUA DISTRICT OF THE COALINOA 

 QUADRANGLE, CALIFORNIA 



BY ROY E. DICKERSON 



(Abstract) 



The Eocene strata between Domengine and Oantua creeks, Coalinga quad- 

 rangle, belongs to the Tejon group. These strata appear to be equivalent to 

 the Eocene strata in the vicinity of Mount Diablo. They apparently represent 

 a longer portion of Eocene time than the Tejon of the type locality. 



The fauna of the lowermost beds is older than the Rimella simplex Zone, 

 which is the fauna of the type Tejon. This lowermost fauna is tentatively 

 correlated with the Turbinolia Zone of the Mount Diablo region. 



The fauna of the white sandstone member is, as a whole, the equivalent of 

 the typical Tejon, although the fauna from the uppermost beds may be tran- 

 sitional between the Rimella simplex Zone and the Siphonalia sutterensis Zone. 



FAUNA OF THE TEJON IN THE SAN DIEGO COUNTY 

 BY ROY E. DICKERSON 



(Abstract) 



The Tejon-Eocene strata of San Diego County have yielded a fauna of over 

 ninety forms, many of which are common species in the Tejon of Canada de 

 las Uvas. The Rimella simplex Zone is present in both localities. Orogenic 

 movements in post-Eocene time have been far less vigorous in the vicinity of 

 San Diego than in middle California. 



MOLLUSCAN FAUNAS FROM DEADHANS ISLAND 

 BY T. S. OLDROYD 



(Abstract) 



Small areas in this locality have recently yielded a great number of species, 

 some of which are new. A review of the collecting in this vicinity is given 

 and the ranges of some of the species are considered. 



