-'■]'! The America)) Geologist. April, 1881 
zon of the Hosselkus limestone. It is characterized by pen- 
tagonal crinoid stems, Monotin, and so forth. Mr. James E. 
Mills* lias called attention to a bed of conglomerate in this 
formation on Rush creek in Plumas county, containing pebbles 
of granitoid and other intrusive igneous rocks, plainly indi- 
cating the existence of a land area and presumably a moun- 
tain range in the northern Sierra Nevada before the deposition 
of the Cedar formation. The slates of the Cedar formation 
on Hush creek are continued southward across the eastbranch 
of the north fork of the Feather river and form part of the 
high ridge to the north of Meadow valley. Except that 
Monotis has been found at Sailor canyon, there is no evidence 
of the existence of this horizon in the central or southern 
Sierra Nevada. 
Sailor Canyon Beds. 
At Sailor canyon, which drains into the American river 
about six miles southeast of Cisco, are a series of beds from 
which Mr. Lindgren and Dr. Cooper Curtice have collected 
fossils, concerning which Prof. Hyatt states :f 
• - Tlie discovery el' Monotis beds above the Carboniferous in American 
canon, south of Cisco, California, show the probable existence of the 
Trias there, hut just above these, in Sailor's canon, occur beds of /)<ion- 
eUa which were more doubtful. The Daonellse, although hitherto con- 
sidered exclusively Triassic, occur in pari near the upper limits of their 
distribution in curious association with Ammonitime of very doubtful 
aspect. These A mmonit ina' are not. as a whole, like any fauna hereto- 
fore described as Triassic. They have a distinctly Liassic facies, and 
with them Dr. Curtice found two specimens of Aptyehi of the rugose 
type, which in Europe have not yet made their appearance below the 
Upper Lias.*' 
Milton Series. 
The first locality to the south of Genessee valley where 
there is evidence of the Jura-Trias is on the southeast slope 
of the Sierra buttes. Some years ago the writer saw in the 
collection of Mr. C. W. Hendel, of Laporte, Plumas county, a 
very distinct impression of an ammonite on a piece of black 
slate, which Mr. Hendel informs me was obtained b} T a miner 
from the spot where the mill of the Phoenix gold quartz mine 
now stands. There is at this point a narrow lens of black si- 
*Bull. Geol. Soc. Am., vol. 3, p. 42i). 
(Abstract in Am. .lour. Sci.. vol. 47, p. 14"2. The abstract is not 
quoted word for word. 
