Shasta County, California. — Fairbanks. 27 
The fossils were studied by J. P. Smith and pronounced to be 
the equivalent of the Hardgrave sandstone, Lower Jura, of 
Plumas county. It seemed probable that a much larger col- 
lection might be made from the upper portion of the canon, 
but the thickness of the brush prevented at that time any 
farther investigation. The strata are vertical or dip at a high 
angle to the east, and strike nearly north and south. 
Mr. Diller has also obtained fossils from other localities in 
the Big Bend region, apparently higher in the series, for Prof. 
Hyatt considers them as probably equivalent to the Mormon 
sandstone. The Bend formation then consisting of slates and 
argillaceous limestone embraces as far as is known the Lower 
and Middle Jura. 
The Trias of Squaw Creek. Farther to the west, the divide 
between Pitt river and Squaw creek is capped by extensive 
limestone beds, which are greatly faulted and broken. The 
limestone begins to outcrop prominently on the south near 
the point where the trail from Madison's to Brock's crosses 
the divide. It extends northwards for about eight miles, 
when its course carries it across Squaw creek. It is known to 
extend to the divide south of the McCloud river. The beds 
are not absolutely continuous, but swell and contract in lens- 
like forms. The northern portion of the limestone and in- 
closing shales has a vertical dip, but about five miles north of 
Madison's the strata change their position, and the limestone 
in part caps the divide, dipping to the east at varying angles. 
The limestone presents bold cliffs several hundred feet high to 
the west, and reaches in places an elevation of 4,000 feet. 
On the summit a little north of the trail to Brock's the lime- 
stone rises in high and rugged pinnacles. Here a rich 
Triassic fauna was found. The fossils are chiefly cephalopods 
and are well preserved ; a large number of species was col- 
lected, many of them being new. In a gulch at the southern 
extremity of the main limestone range there is an opportunity 
t<i study the transition from limestone to slate, made doubly 
interesting by the fact that some species in the limestone can 
be followed for several hundred feet into the argillaceous 
slate. These fossils were studied by J. P. Smith, who re- 
ported them to belong to the Karnic division of the Upper 
Trias, while the calcareous and argillaceous slates are proba- 
