Crandall — Santa Clara Valley Region in California. 45 



Belmont Hill. — From Belmont Hill, west of the town of 

 that name, these four Knoxville forms have been collected. 



Aucella Piochi Gabb 

 Gastropods, sp. indet. 

 Aucella erassicollis Keyserling 

 Hoplites fragment 



There are two different places where the fossils were found 

 in this general locality. A. little west of Belmont Hill, the 

 Hoplites, gastropods and a fragment of an imprint that might 

 be either an Aucella or an Inoceramus were found by Dr. 

 J. C. Branner. 



About one-half mile southwest from this place, in the main 

 creek bed, Dr. Branner and Mr. R. Anderson found a bowlder 

 that contained Aucella Piochi. The material of the bowlder 

 seemed the same as the rock exposed in the creek bed, although 

 no fossils have yetbeen found in the rock in place. 



The bowlder containing the Aucellae is a fine-grained con- 

 glomerate, made up of small pebbles of jasper. 



On Belmont Hill these fine-grained conglomerates rest upon 

 the jaspers of the Franciscan series. These pebbles of jasper in 

 the conglomerate here are proof of the unconformity between 

 the Franciscan rocks and the Knoxville. 



A table is given below which shows the distribution of spe- 

 cies from the various Cretaceous horizons of this region. 



The Horsetown Horizon. 



In the first work done upon the Cretaceous of California, 

 two divisions of the Cretaceous were recognized — the Shasta and 

 the Chico groups. The Shasta group was subdivided into two 

 horizons by Dr. White and the upper part was called Horse- 

 town, and was considered to have a distinctive fauna.* 



The tendency of other geologists has been to class this hori- 

 zon with either the Upper or Lower Cretaceous rather f than 

 consider it as independent. 



Mr. Anderson is of the opinion that the Horsetown is a 

 separate horizon. £ 



Diller and Stanton have shown that there was continuous 

 sedimentation throughout the Cretaceous in northern Cali- 

 fornia; that the fauna of Knoxville, Horsetown, and Chico 

 intergrade, but still the three horizons are considered to have 

 sufficiently distinctive faunas to be separated a § 



-Correlation paper, Ball. 82, U. S. Geol. Survey, p. 184. 

 fG. F. Becker, Early Cretaceous of Calif., Bull. Geol. Soc. Am., ii. 204 ; 

 J. S. Diller, Geology of Calif, and Oregon, Bull. Geol. Soc. Am., iv, 212. 

 ^Cretaceous of Pacific Coast, Proc. Cal. Acad. Sci. , 3d series, ii, 1, p. 47. 

 §The Shasta-Chico series, Bull. Geol. Soc. Am., v, 464. 



