46 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



In the Alum Rock canyon, a few miles east of San Jose, 

 Dr. J. P. Smith has found Ancella fiochi associated with 

 Beleinnites; and in the canyon of Stephens Creek, a few 

 miles west of the same town, he has reported a similar bed 

 of dark, siliceous shale containing Ancella fiochi. 



Still farther south, near Gilroy, on the road from San 

 Jose to Santa Cruz, Ancella crassicollis has been found by 

 Dr. Smith and others, along with an Olcostepkanus, and 

 other undetermined species. 



The most southern locality in which Ancella has yet 

 been discovered in California is a few miles north of San 

 Luis Obispo. Dark, Ancella-heanng shales occur in the 

 hills to the west of Santa Margarita, where in one exposure 

 of them on the Eagle Ranch the slender form of Ancella 

 piochi is very abundant. An ammonite, probably an Hop- 

 lites, was also obtained at this locality. 



While not exactly demonstrable from our present knowl- 

 edge, it yet seems evident that a more or less connected 

 line of deposits of Knoxville (Paskenta) age can be traced 

 along the eastern border of the basin of San Francisco Bay 

 from beyond San Jose northward. This line of deposits 

 will be be seen to include Gilroy, Alum Rock, Haywards, 

 and the exposures near Berkeley. The topography of the 

 country suggests also that it might even be extended by a 

 little exploration to connect with deposits of the same age in 

 Napa Valley, at Sulphur Creek, and even to Knoxville itself. 



One other isolated locality deserves to be mentioned; 

 that upon the northern flank of Mount Diablo. Mr. Turner 

 discovered here Ancella-hearmg shales in contact with 

 metamorphic rocks of a still older series. The fauna of 

 these shales consists of Ancella which he refers to the type, 

 A. mosqnensis, Bclcmnites, Inoccramns, and a few species 

 of gasteropods. 



It has already been noticed that in the strata referred to the 

 Paskenta horizon beds and lenses of limestone are common ; 

 and as usual, according to Turner, here, too, all the fossils 

 with the exception of Ancella are found in layers of lime- 

 stone. It seems most probable, therefore, from the foregoing 



