392 University of California Publications in Geology [Vol. 8 



In the latter were found Astrodapsis tumidus and A. ivhitneyi. The 

 Scutella gabbi zone was stated to be below and distinct from the Astro- 

 dapsis zone. 



In 1898 H. W. Turner, in a paper on "The Rocks of the Mount 

 Diablo Range of California," used the name "San Pablo Formation" 

 for marine beds on the north and south sides of Mount Diablo which 

 he had previously referred to the Pliocene and which he recognized 

 to be the representative of the San Pablo of Merriam. In this paper 

 Turner gives a detailed description of the San Pablo, especially in the 

 region of Kirker Pass, accompanied by a diagrammatic section of the 

 San Pablo in the vicinity of Kirker Creek on the north side of Mount 

 Diablo. He divides the section into four zones — A, B, C and D. 



Turner in this paper again mentions the leaf-bearing beds in the 

 San Pablo and discusses the possibility of correlating these beds with 

 the auriferous gravels of the Sierra Nevada on the basis of the leaf 

 collections. 



In 1899 Professor J. C. Merriam 7 published a paper entitled "The 

 Tertiary Sea Urchins of Middle California," in which he redescribed 

 some of the most important of the Tertiary sea-urchins of California. 

 The fauna] zones of the San Pablo were outlined much as in his paper 

 of the year before. 



In 1909 Dr. C. E. Weaver 8 published a paper on the "Stratigraphy 

 and Palaeontology of the San Pablo Formation in Middle California," 

 in which he described seven different sections of the San Pablo, includ- 

 ing the type section on San Pablo Bay. Seventy-seven species of 

 marine invertebrates are listed. He concluded that the San Pablo 

 was of Pliocene age because of the large percentage of Recent species. 



In 1912,° the writer described in some detail the San Pablo section 

 on the north side of Mount Diablo. Reference will be made later to 

 this paper under the discussion of the San Pablo on the north side of 

 Mount Diablo. 



e Jour. Geol., vol. 6, pp. 493-499, 1898. 

 i Proe. Calif. Acad. Sci., 3d series, vol. 1, pp. 161-175, 1899. 

 s Univ. Calif. Publ. Bull. Dept. Geol., vol. 5, pp. 243-269, 1909. 

 o Clark, Bruce L., Univ. Calif. Publ. Bull. Dept. Geol., vol. 7, no. 4, pp. 47-60, 

 pi. 7, 1912. 



