~ ous shales and layers of flint and jaspery rock, which resemble 
*, 
80 W. P. Blake on the Gold Region of California and Oregon. 
an interesting fact that the metal is more common in the North- — 
ern mines, and that it is most abundant on the coast. 
Mercury.—Santa Clara Co., New Almaden.—The ore at 
this mine is a massive sulphuret (cinnabar) and its character 
and association have already been described in this Journal, vol. 
vi, p. 270, and xvii, p. 438, 
The rocks at the locality appear to be metamorphosed sedi- — 
mentary strata: ‘They crop out at several places below the mine — 
on the side of the hill, and consist of regular strata of argillace- 
we of San Francisco near the Mission and Fort Point. Ser-_ 
pentine rock is found in, and near the mine and trappean rocks 
e also found in the vicinity. 
Guadalupe Mine. 
- another locality of cinnabar about 
three miles from the Imad i 
Almaden mine, but it is not now 
worked. 7 
Monterey Co.—Other localities aré reported in this county and — 
at one point a vein has been opened by parties residing in Mon 
terey. Ihave no definite information of its extent, but speci 
‘ ; } xtent, b : 
mens of the ore of fair quality were exhibited in Monterey. 
PPE l 
the carbonate resulting from its decomposition, are found in many 
of the veins of auriferous quartz that have been opened in differ- 
ent parts of the State. e 
the blue and green carbonates occur with quartz in M 
at Alisal; also in Santa Barbara Co. and San Luis 
vein of copper pyrites occurs on the 
Basin about seven miles east of Johnson’s river. 
thoroughly opened. Its discovery is one of the results of 
geological reconnoissance in connection with the R. R. Survey. 
