Geology of California. — lurner. 321 
sandstones, diabases, and glaucophane schists, and with the Knox- 
ville shales. The area at Knoxville is by no means the onl}^ large 
one; another as large or larger occurring to the west and south- 
west of New Idria. If all these serpentines are post-Knoxville in 
age it follows that the upheaval that accompanied their extrusion 
must have been felt over a considerable area of country. The ex- 
trusion of the serpentine must have occurred before the deposi- 
tion of the Wallala beds (middle Cretaceous) for they were shown 
b}^ Dr. Becker to contain rolled fragments of that rock. 
While at Knoxville during the quicksilver investigation the 
writer noted a conglomerate near Eticuera creek, some distance to 
the southeast of the town. This conglomerate contains water- 
worn nodules of the limestone of the Knoxville beds in which are 
well preserved J. wceZ^i^, indistinguishable from those occurring at 
Knoxville in exactly similar limestone. There are also numerous 
pebbles of quartz-porph3'rite in this conglomerate, the sand}' matrix 
of which contains well preserved belemnites, presumably Belem- 
nites impressus, Glabb. This conglomerate may be supposed to 
represent the Horsetown or late Shasta beds, which according to 
Dr, White correspond nearly to the Grault of Europe. This would 
presuppose an upheaval at the close of the Knoxville epoch and 
it may well be that this upheaval was caused by the extrusion of 
the serpentine, no pebbles of which, however, were noted in the 
conglomerate above described. 
Notes on a further study of the pre-Cretaceous rocks of the California 
Coast ranges; by Haroi,d W. Fairbanks; American Geologist, Feb- 
ruary, 1893. 
In the paper just reviewed Mr. Fairbanks treats of the geology 
of the northern coast ranges, and in the present paper of the dis- 
trict from San Francisco south. The extreme southern coast 
ranges are also treated of, but as the}' are not directly concerned 
in the question of the age of the Coast range metamorphic series, no 
remarks will be made upon that part of the paper. In general it 
may be remarked, that the author has revised the geology of a 
very large district, comprising in fact most of California, in a re- 
markably short time. 
On page 70 of the present paper occurs the following: "In 
my former paper I traced the Paleozoic rocks of Shasta county, 
part Carboniferous and part probably Devonian, south along the 
