66 University of California Publications in Geology [VOL. 8 



by Gabb. It seems desirable, after having cut out the Chico portion of Gabb's 

 Martinez which was probably not the one on which he based the group, to 

 apply the name used by him to the distinct fauna or group which remains. 

 As to the nomenclature of the supposedly conformable series, including the 

 Martinez and Tejon, it seems best to apply to it for the present the term 

 Martinez-Tejon series, though future convenience may demand a special series 

 name. To apply the name Tejon to the whole series would be to modify con- 

 siderably the meaning of this term as used originally, and would have besides 

 the fault of taking the name from a smaller division to apply it to a larger, 

 leaving the first to be virtually renamed. 



He then closed with a definition of the Martinez Group as follows : 



The Martinez group, comprising in the typical locality between one and 

 two thousand feet of sandstones, shales, and glauconitic sands, forms the 

 lower part of a presumably conformable series, the upper portion of which is 

 formed by the Tejon. It contains a known fauna of over sixty species, of 

 which the greater portion is peculiar to itself. A number of its species range 

 up into the Tejon and a very few long-lived forms are known to occur also 

 in the Chico. Since the Martinez and Chico are faunally only distantly 

 related, it is probable that an unconformity exists between them. Though 

 satisfactory correlation of California formations with the subdivisions of the 

 standard geological scale can be accomplished only when the local scale is fully 

 worked out, we may, for the present at least, accept Mr. Stanton's correlation 

 of the Martinez with a portion of the Eocene. 



In a general correlation paper, Dall 4 places both the Martinez and 

 the Tejon as correlative of the Midway stage of the southeastern 

 United States and the Cernaysian of Europe. 



Lawson 5 in describing a section in the neighborhood of the type 

 locality of the Martinez substitutes the name "Karquinez series" for 

 that of Merriam's Martinez-Tejon series, and estimates their combined 

 thickness as 4300 feet. 



In a paper entitled " Contribution to the Palaeontology of the 

 Martinez Group," Weaver 6 carefully described the distribution of the 

 Martinez, its stratigraphic relations, recognized two faunal zones, 

 correlated it with the Midway of the Gulf States and the Aquia stage 

 of Maryland and Virginia, and described several new species. In 

 summary he said : 



.... the Martinez represents a distinct division of time in the geological 

 history of California. It contains a fauna distinct from both the Chico and 



* Dall, W. H., A Table of the North American Tertiary Horizons correlated 

 with one another and with those of western Europe, 18th Ann. Eept. U. S. Geol. 

 Surv., part 2, pp. 327-348, 1898. 



s Lawson, A. C., A Geological Section of the Middle Coast Eanges of Cali- 

 fornia, Science, n.s., vol. 15, p. 416, 1902. 



Weaver, C. E., Contribution to the Palaeontology of the Martinez Group, 

 Univ. Calif. Publ. Bull. Dept. Geol., vol. 4, pp. 101-123, 1905. 



