wuire.] TRIASSIC FOSSILS. 107 
other localities than those herein mentioned. It is reasonable therefore 
to regard it as peculiar to the horizon which furnishes the Cephalopods 
and other fossils pertaining to the peculiar fauna discussed in this 
article. 
The following section is copied from Dr. Peale’s article in the bulletin 
of this survey before mentioned, and is introduced here for the purpose 
of showing his views of the geology of the district in question after the 
very brief examination which he gave it in the autumn of 1877. 
General section of the Jura-Trias in Southeastern /daho and Western Wyoming. 
a 
(2) 
iS 
aa] 
& | 5. Red and gray shales, with green sandstones and irregular greenish arenaceous 
5 limestones at top. Thickness, 700 fees. 
=I 
S| 8 
= & 
yi ae 
|e 
i) Fa 
4 | 4. Laminated liméstones, blue at base, passing into gray at top, succeeded above 
Zi by grayish, calearcous shales; many of the layers are probably arenaceous. 
OD & Thickness, 800 feet. 
4 5 
, : 
ia fal 
q 
a 
i=) a 
3 & | 3. Red quartzitic sandstones with shaly arenaceous and calcareous layers at the 
A base of the section. ‘These are probably the equivalent of the typical ‘‘ Red 
a Beds” of the Eastern Rocky Mountains. Thickness, 1,000 + feet. 
FS 
2 Alternations of reddish and greenish sandstones, and arcnaceous and calcareous 
shales, with blue and gray limestones; generally laminated. Thickness, 
1,009 + feet. 
1 
B 
| 3 
| i 
| oa 
a 
nS 1. Massive grayish-blue limestone, overlaid by quartzite and dark-blue laminated 
z limestone. Thickness, 1,000 + feet. - 
Cr) 
i 
fa 
ef 
9 
Nos. 1 and 2 of the foregoing section embrace the same strata which 
are represented by the previous section of locality No. 1. 
The fossiliferous strata of the three localities herein especially consid- 
ered contain all the new fossil forms which are described in this paper, 
together with the three following identified species, namely Terebratula 
