34 Grandall — Santa Clara Valley Region in California. 



Knoxville horizon : 



Aucella Piochi Gabb 



Pelemnites, sp. inclet. 



Modiola major Gabb 



Lucina colusaensis Stanton 



Pecten compltxicosta Gabb 



Cardinia f 



Myoconcha ? 



Turbo 



Atresias liratus Gabb 



Horsetown horizon : 



Phylloceras onoense Stanton 



Chico horizon : 



Hoplites, sp. indet. 

 Inoceramus, sp. inclet. 



Most of the fossils were found in bowlders of limestone lying 

 upon shale beds, but some of the Aueellae were found in a fine 

 conglomerate. With the forms listed above are thick, Yenus- 

 like shells which cannot be separated from the matrix for 

 identification, but are considered by Dr. Merriam to resemble 

 Paskenta species. It should be noted here that Phylloceras 

 onoense is a Horsetown form, and does not belong with the 

 fossils from the Knoxville. 



Fragments of Hoplites and an Inoceramus, which are the 

 basis of the identification of the Chico horizon, have been found 

 in sandstone beds in the hills directly east of the buildings of 

 the University of California. Little is known of the beds in 

 between the Chico and tbe A ucella -bearing horizons, but it 

 seems probable that there could be only a very small thickness 

 of rocks intervening. The whole series of Cretaceous here is 

 overlain by Tertiary, and in the hills east of Berkeley disap- 

 pears under the later formations. It reappears in the vicinity 

 of Haywards, about eighteen miles southeast of Berkeley. 



Mi. Diablo. — The Knoxville at Mt. Diablo has furnished 

 the following characteristic forms : 



Aucella Piochi * Gabb 

 Pelemnites 

 Inoceramus 

 Gastropodas 



The slightly altered Knoxville beds, with a high and variable 

 angle of dips, rest directly upon the older Franciscan rocks, 

 and are intruded by dikes of peridotite. The unconformity 

 between the Cretaceous and the Franciscan is plainly marked. 



The Knoxville series at this place is composed of dark shales, 

 with occasional sandy layers, and small lenticular masses of 



* Given as Aucella mosquensis, H. W. Turner, Bull. Geol. Soc. Am., ii, 399. 



