Clark: The San Lorenzo Series of Middle California 



65 



"The Neocene record of the Temblor Basin, California, and the Neo- 

 cene deposits of the San Juan District, San Luis Obispo County," a 

 number of species are described from the Miocene of California and 

 from the Oligocene and Miocene of Oregon and "Washington. 



The first attempt to separate the faunas of the marine Miocene 

 and Oligocene of Oregon and Washington was made by W. H. Dall 

 in his paper entitled "The Miocene of Astoria and Coos Bay, Ore- 

 gon." 37 He recognized how incomplete was the knowledge at that 

 time of the faunas of these horizons in that region. In commenting 

 on a list of invertebrate species given in his paper, which were 

 obtained from the beds in the vicinity of the town of Astoria, Dall 

 says : 



The following list of fossils collected at Astoria contains species referable 

 both to the Aturia beds and to the Miocene above it. Before these can be finally 

 disentangled from one another to form two distinct and accurate lists, the 

 Oligocene and Miocene faunas of the region must be much more fully worked 

 out than has hitherto been done. The species that have been recognized in other 

 Oligocene horizons are indicated, and the general locality is stated in the list, 

 but with regard to most of them we do not know whether they are exclusively 

 Oligocene or not. Unfortunately the beds at Coos Bay which may be referred 

 with some probability to the Oligocene, and might have enabled us to solve the 

 problem had they contained a fully representative fauna, are almost destitute 

 of fossils.ss 



Out of a total fauna of sixty-three, only nine are listed as belonging 

 exclusively to the Oligocene. Other points where Dall believed he 

 recognized the presence of the Oligocene fauna are at Tillamook, 

 Oregon, and near Port Blakeley on Puget Sound. Apparently Dall 

 placed much confidence in the genus Atiiria as being distinctive of 

 the Oligocene; later collecting has shown that it extends into higher 

 formations than was supposed. 



A. B. Reagan, in his paper entitled "Some Notes on the Olympic 

 Peninsula, Washington," 30 covers very much the same field as did 

 Arnold in his paper, "Reconnaissance of the Olympic Peninsula," 

 to which reference has already been made. Very little that is new 

 is added to the results already presented by Arnold, except the de- 

 scriptions of a few new species and the addition of a few more species 

 to the lists already known from the different localities. 



The following year, Reagan published several faunal lists almost 



Dall, W. H., U. S. Geol. Surv., Prof, paper no. 59, pp. 1-278, 1909. 

 38 Dall, W. H., op. cit., p. 11. 



3»Eeagan, A. B., Trans. Kans. Acad. Sel, vol. 22, pp. 131-238, pis. 1-6, with 

 sketch map, 1909. 



