Geology and Mineralogy. 145 
II. GroLtoagy AND MINERALOGY. 
1, Zhe Pte hel tea Gravels of the Sierra Nevada of Californ 
by J. D. Wartn Vol. vi, No. 1 (ist Part) of the Menoray of 
volume belongs strictly to the series of Reports of the Geological 
aa of California, of which Professor “ca was Director; 
his es necessary because these were made out ‘of the earlier 
rocks, and owe their Bron and wonderful extent to the 
considering the many peculiatitiel in the mountains an strata 
set forth, these pages have no less interest to the geologist than 
those which follow. Only the more prominent peculiarities of 
the Sierra Nevada are here cite 
(1) Its singleness of mass, unlike the Coast Range and Peal 
i which consist of many prominent ridges. 
5) 
we above the sea-le vel, but none quite ee 15, 000 fet 
st oa ose between the parallels of 36° and 37° 30’. 
a gree idening southward, granite making 
nearly the whole of a mass north of the Tahichipi Pass almost 
to Mariposa Co aunty, but north of this narrowing, and the schists 
(clay-slate, mica schist, chloritic and diabase schists, with so: 
entine estone, mostly of Triassic and Jurassic age, id 
nothing alee than Carboniferous), constituting much of the range 
Am. Jour. Sc1.—Tuirp Serres, Vor. XVII.—No, 104, Aveust, 1879. 
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