Grandall — Santa Clara Valley Region in California. 43 



Near Silver Creek, in the southwest corner of the Mt. Hamilton 

 sheet, the Franciscan rocks are present, bnt whether the Cre- 

 taceous lies upon them or is faulted against them is not known, 

 as intruded serpentine has obscured the relations. 



Gilroy. — Gilroy is the next known locality of Cretaceous in 

 the Santa Clara Valley region and is the furthest south of those 

 under consideration. In a road cut on the Whitney ranch, 

 about four miles west of Gilroy, Dr. J. P. Smith found the 

 following fossils : 



Aucella crassicottis Keyserling 

 Oleostephanus cf. mutabilis Stanton 



These were in a hard black shale similar to the Knoxville shale 

 elsewhere. Near where the fossils were found, the serpentine 

 has been intruded into the shales but there has been no ap- 

 preciable metamorphism. 



New Almaden. — Gabb mentions Aucella Piochi from near 

 the New Almaden mine southwest of San Jose, but does not 

 give the exact locality.* Dr. Becker f states that the greater 

 part of the surface at this place is occupied by the metamorphic 

 rocks, pseudodiorites, pseudodiabases, phthanites, limestones and 

 serpentines. The age of these he gives as Cretaceous because 

 of the Aucella found by Mr. Gabb. It is known now that 

 some of the rocks classified by Becker as Cretaceous are pre- 

 Cretaceous. We may assume, then, that there is an area of 

 Cretaceous or Knoxville age near New Almaden, resting upon 

 the metamorphic rocks of the Franciscan series, which have not 

 been properly differentiated from them. 



Pigeon Point. — Cretaceous beds exposed along the coast, 

 in a section from \ to 2-| miles wide, and 12 miles long, 

 starting from near the mouth of Pescadero Creek and extend- 

 ing southward to Ano Nuevo Bay, have furnished the following 

 Chico fossils : 



One and a half miles southeast of Pigeon Point on coast. 



Turritella chicoensis Gabb 



Trigonia evansana Meek 



Panopaea concentrica Gabb 



Area breweriana Gabb 



Telli?ia, sp. indet. 



Nucula truncata Gabb 



Cucullaea bowersiana Cooper 



Ostrea, sp. 



One mile north of Pigeon Point on coast. 

 Trigonia leana Gabb 

 Mactra, sp. indet. 

 Glycymeris Veatchi Gabb 



*Pal. Cal., ii, 247. fMon. xiii, U. S. Geological Survey, p. 310. 



