1916] Martin: Pliocene of Middle and Northern California 217 



moon Bay were classed as Miocene Tertiary, and those at Alio 

 Nuevo Bay as Pliocene. 



A list of California fossils, together Avith their geological and 

 geographical range, was compiled and published in 1888 by Dr. J. 

 G. Cooper in the Seventh Annual Report of the State Mineralogist. 4 

 In general the formations at Halfmoon Bay and Seven Mile Beach 

 were considered to be Pliocene. Some of the beds betAveen Half- 

 moon Bay and Santa Cruz were classed as Miocene. 



In 1893 Professor A. C. Lawson published the first complete 

 description of the marine sediments at Seven Mile Beach and ap- 

 plied the name "Merced Series." 8 In discussing this series Pro- 

 fessor Lawson described the structural and stratigraphic features 

 and the various lithological types. He also gave a faunal list 

 which, according to Dall and Cooper, was indicative of the Pliocene. 

 The unconformable relations between the Merced Series and the 

 overlying brown and tawny sands designated the "Terrace Forma- 

 tions," was briefly discussed. The beds at Pillar Point were in- 

 cluded in this discussion, and those south of Halfmoon Bay Avere 

 referred to. 



During the same year Professor Lawson published his "Sketch 

 of the Geology of the San Francisco Peninsula," in which he re- 

 viewed the previous work on the Merced Series and brought out more 

 strongly the proof of the fault along the south side of San Bruno 

 Mountain along which movement took place, letting the strata of 

 the Merced Series down against the rocks of the Franciscan Series 

 of which San Bruno Mountain is composed. This brought out more 

 clearly the stratigraphic relations of the whole series and the 

 structural origin of Merced Valley. A small addition was also 

 made to the faunal list which indicated the Pliocene age of this series. 



During the summer of 1894 Professor Lawson made a recon- 

 naissance trip north along the coast from San Francisco to Eureka. 7 

 The account of this trip contains a description of the Neocene sedi- 

 ments which occur in the Eel River Valley. The limits of the area 

 over which these beds occur was not defined, but two cross-sections 

 were made, one at Ferndale and the other at Scotia, giving the 



* Calif. State Mining Bureau, Seventh Annual Report of the State Mineral- 

 ogist, 1888. 



s Univ. Calif. Publ. Ball. Dept. Geol., vol. 1, pp. 115-160, 1893. 

 o U. S. Geol. Survey, Fifteenth Annual Report, p. 459, 1893. 

 t Univ. Calif. Publ. Bull. Dept. Geol., vol. 1, p. 255, 1894. 



