Lawsun "I 

 PalacheJ 



The Berkeley Hills. 



353 



The area mapped has served for the past eleven years as a 

 training-ground for successive classes of students in field geology. 

 The great variety of formations and the complexity of structure 

 which characterize the field, coupled with its close proximity to the 

 University, and its accessibility at all seasons, have been of great 

 advantage in the work of instruction in geology. In the examina- 

 tion of the ground by these classes not a few observations have 

 been contributed by the students. It is anticipated that they will 

 be the readers most interested in this essay. In writing it, the 

 service which might be rendered to future classes in field geology 

 has always been borne in mind. This fact will explain to geological 

 readers at a distance the somewhat elementary treatment given to 

 certain phases of the subject, the effort having been throughout the 

 paper to make it not only a description and discussion of the field, 

 as a general contribution to the geology of the Coast Ranges, but 

 also to arrange the sequence of observations on the lines which 

 have been found most profitable for the field class to follow in the 

 study of the region. 



GENERAL SECTION OF THE BERKELEY HILLS. 



FRANCISCAN SERIES. 



Sedimentary Rocks. — The first rocks that we meet with in ap- 

 proaching the Berkeley Hills from the gentle slope upon which the 

 town of Berkeley is situated, are by no means easy to characterize 

 in a few words. On the University Campus, in some of the older 

 excavations, as at the Conservatory and North Hall, and along some 

 of the road cuttings, there are exposures of a rather hard bluish- 

 gray sandstone which weathers to a rusty yellow color. The same 

 rock is exposed in the bed of Strawberry Creek just above the 

 College Avenue entrance bridge. This sandstone is of a massive 

 character and has a uniform, moderately fine, texture. Although 

 traversed by numerous quite irregular divisional planes, it is practi- 

 cally impossible, as a rule, to detect in the exposures available any 

 satisfactory evidence of bedding or stratification. This type of 

 sandstone is common in the region about the Bay of San Fran- 



