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University of California Publications in Geology [Vol. 8 



SUMMARY 



Conclusions based upon the work of all investigators are as follows : 



1. The Martinez Group is a definite unit both stratigraphically 

 and faunally. 



2. An unconformity exists between the Martinez and the under- 

 lying Chico and between the Martinez and the overlying Tejon. 



3. The Martinez was deposited in two distinct basins, one being in 

 the vicinity of San Francisco Bay and the other in the neighborhood 

 of Los Angeles. 



4. These basins of deposition are only partially coextensive with 

 the larger basin of the Tejon. 



5. The faunal differences between Chico and Martinez and between 

 the Martinez and the Tejon are very great. 



6. Three major faunal zones have been recognized in the Martinez 

 Group. 



7. The Martinez is in part the correlative of the Midway of the 

 Gulf States and in part represents a division of time earlier than the 

 Midway. 



DESCRIPTIONS OP SPECIES 

 Anthozoa 

 FLABELLUM, sp. 



A short, conical, slightly curved, and somewhat compressed form 

 is found in the Martinez at San Pedro Point. It appears to have about 

 twenty-fonr principal septa with one or two secondary septa in the 

 interspaces. Costae appear to correspond to each of the principal 

 septa. The principal septa appear bifid but this may be due to 

 weathering. A small, short pedicel is found on some specimens. 



Dimensions. — Greater transverse diameter of calice, 9 mm. ; lesser, 

 8 mm. ; height, 8.5 mm. 



Occurrence. — Martinez at San Pedro Point, San Mateo County, 

 California. 



PAKACYATHUS( ?), sp. 

 Plate 6, figure 2 



Short, conical, circular, with base truncated, attached at truncation. 

 Costae correspond to all the principal septa which are numerous. 

 About thirty-six of these were counted. One and sometimes two 

 secondary septa are found between the primary ones. Costae appear 

 to be granulated. Wall rather thick. 



