1913] 



Louderback : The Monterey Series 



and has been used by him and some others consistently ever 

 since for the rocks of this depositional cycle. It will be used in 

 this paper in the further discussion of the subject. 



The Vaqueros sandstone, the Monterey shale, the Modelo sand- 

 stone, are mere depositional facies, and while rocks designated 

 by any of these names may be analogous in different localities, 

 they are frequently not correlative. The "Modelo formation" 

 is an artificial and, as far as evidence goes, meaningless group, 

 not even applicable throughout the region of the Santa Clara 

 Valley oil fields and it should be abandoned. 



PART II 



CRITICAL REVIEAA 7 OF OUR KNOWLEDGE OF THE 

 MONTEREY SERIES IN CALIFORNIA AND 

 HISTORY OF ITS NOMENCLATURE 



PURPOSES 



In the light of the ideas developed in Part I of this paper, 

 it is proposed to review critically the literature that has had 

 most influence on present day conceptions of the California 

 Middle Tertiary, with the purpose (1) of determining if pos- 

 sible the extent to which these ideas will apply to other areas; 



(2) of critically examining the evidence presented for various 

 other interpretations and the bases for the diverse nomenclature ; 



(3) of bringing out the main characteristics of the Monterey 

 series in the different areas in which it has been studied. 



EARLY NOTICES— PREVIOUS TO 1893 

 Probably the first reference that occurs in the literature to 

 the most peculiar member of this series is in an article by W. P. 

 Blake, published 21 in 1855 and entitled "Notice of Remarkable 

 Strata containing the remains of Infusoria and Polythalamia in 

 the Tertiary Formation of Monterey, California." This is fre- 

 quently referred to as the paper in which the formational name 



21 Proc. Acad. Sei., Philadelphia, vol. 7, pp. 328-331 (1855). 



