1913] 



Louderback: 



The Monterey Series 



207 



into two horizons — the zone of Turritella hoffmanni and that of 

 T. oeoyana, the former being the older, and as it is not found 

 to the east of the Great Valley, it may mean that "the sea had 

 not reached as far east in the earliest Miocene as it did later, 

 and that the thick shale beds over the lower sands of the western 

 region were formed while sandy T. oeoyana beds were being' 

 deposited in the east" (p. 381). 



Southern Coast Ranges, F. M. Anderson, 1901. — F. M. An- 

 derson this same year presented in abstract form 40 the "Stra- 

 tigraphy of the Southern Coast Ranges of California," with 

 special reference to the interior ranges. He makes use of the 

 twofold division, calling the lower the Pescadero sandstones 

 (after Ashley), which he says reach a thickness of 11,000 feet, 

 in the Carrisa [Carrizo] Valley of 14.000 feet. — alternating sand- 

 stones and shales, the former predominating; and the upper, the 

 Monterey shales, 3400 feet, including 200 feet of sandstone, and 

 some volcanic ash. 



Coalinga Region, F. M. Anderson, 1905. — The following year 

 Andtrson published 47 a "Stratigraphic Study in the Mount 

 Diablo Range of California," dealing especially with the terri- 

 tory in the vicinity of Coalinga and south, lie recognized the 

 Monterey shales, which he claimed were 5500 feet thick at Car- 

 nera [Carneros] Springs, below which are sands and shales." 

 In the light of stratigraphic studies farther north, it is evident 

 that the entire series of sands and shales below the Monterey 

 Shales should be regarded as a distinct member of the Miocene, 

 and the name Temblor Beds is suggested to embrace this aggre- 

 gate of strata" (p. 170). Various lists of fossils are given for 

 different localities, many forms of which correspond to the 

 "Vaquero sandstone" list given by Haehl and Arnold, and to 

 Merriam's Agasoma zone {Turritella oeoyana stage), while some 

 appear more like the "Monterey shale" types of Haehl and 

 Arnold. As Anderson materially revised his stratigraphy in a 

 later paper, further discussion is postponed until the later report 

 is taken up. For the present the point to note is the introduction 

 of the term "Temblor" as a stratigraphic unit, supposed to be 



■»«Geol. Soc. Am. Bull., vol. 15, pp. 581-582 (1904). 



« Calif. Acad. Sci. Proc, 3d series, Geology, vol. 2, pp. 155-248 (1905). 



