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Mineralogy and Geology. 565 
for the Geological Survey to show that the gold-bearing rocks were 
: is is an error, inasmuch as the 
writer of the present notice had several years before distinctly 
u 
ity of thei —~ 
ence was admitted. These assertions are sustained by the follow- 
pears to form ,a lon trending northwes' 
lumne and Calaveras counties. It probably extends much farther 
both north and south. It is believed to be to and con- 
rock is doubtless metamorphic, but as no fossils have beer 
d in it, it is impossible to decide upon the period to which it 
should be refe I y Carboniferous limestone, this 
formation having been rec in the northern part of the State, 
ce he 
ations west of the great central chain 
‘ F © i . . ca 
State were those recognized by Dr. J. B. Trask, and noticed in his _ 
Report of 1855, These were not perhaps identified as gold-bear- 
* “On the age of the gold-bearing rocks of the Pacific Coast.” This Journ., 
xlii, July, 1866. fs 
Report of a Geological Reconnoissance in California. -4to, 1858. Preface, - 
aan (Author's edition of the Geological Report in vol. v, of U. 8. Explorations 
urveys ) ‘ | 
- ¢ [This limestone is traversed in places by quartz veins bearing gold], 
