PAPERS READ BEFORE PACIFIC COAST SECTION 127 



Mr. Merriam indorsed the author's opinion as to the age of this fauna and 

 expressed the opinion that it was more nearly related to the Lower than to 

 the Upper Martinez. 



STRATIGRAPHIC AND FAUNAL RELATIONS OF THE MARTINEZ AND TEJON 

 SOUTH OF MOUNT DIABLO, CALIFORNIA 



BY ROY E. DICKERSON 



(Abstract) 



An unconformity exists between the Tejon and Martinez south of Mount 

 Diablo. The unconformity is marked by Pholas (?) borings recognized in two 

 localities three miles apart and an angular unconformity found in two places. 



Discussion 



Mr. Louderback emphasized the remarkable differences between the Tertiary 

 sediments of the north and south sides of Mount Diablo, apparently indicating 

 complex relationships between land and water and in the diastrophism. He 

 also stated that three or four horizons of Chico fossils had been found south 

 of Curry Canyon. 



Mr. Anderson told of a line of division in the Eocene along the east front 

 of the Diablo range from Coalinga north to New ldria. There is probably 

 an angular unconformity with a thin basal conglomerate in the upper division. 

 Coal is present in the Martinez of this region. On the basis of the fossils, 

 Doctor Dall thought that the lower beds were probably Tejon. 



EOCENE OF THE COALINGA-CANTUA DISTRICT, FRESNO COUNTY. CALIFORNIA 



BY J. A. TAFF 



(Abstract) 



Areal surveys through the Coalinga-Cantua District show that a dual for- 

 mation of white to pink organic shale, conformably related above to a white 

 to buff sand and conglomerate, is of Eocene age. It has been described as 

 Tejon. This Tejon is overlain in marked unconformity by Lower Miocene 

 sands, nnd is underlain with equally distinguished disconfonnity by a group 

 of two or three formations of Eocene ago that have been provisionally corre- 

 lated with the Martinez formation of tbe Mount Diablo District. 



This lower group consists of an upper non-fossilit'erous brown shale, a middle 

 fossiliferous brown sandstone, glauconitic and shaly at base, and a lower 

 Chocolate shale that lias yielded no fossils. The contact at the top of this 

 group shows indications of local pre-Tejon erosion and weathering. 



Both groups of Eocene here represented thin out by progressive overlap 

 southward. 



The stratigraphic relations of the Martinez with the underlying Cretaceous 

 has not been distinguished. 



Discission 



Mi-. Anderson said that Aturia had been found in an 8 Inch bed <>f sandstone 

 in the brown chocolate shale, or lowest member of Mr. Taffs section, if the 



