1872.] 473 [Cope. 
The nature of the flexure of these strata is somewhat obscure. The 
succession of vertical strata is quite similar to that alre: ady noted as seen 
in the bluffs of Evanstown, and the conglomerate would thus be regarded 
as the superior member. Dr. Hayden, however, describes them as con- 
tiguous to cretaceous strata further east. 
We are assisted in concluding as to whether these beds which descend 
abruptly belong to the Wahsatch Group, by a consideration of the curious 
strata exhibited in the two railroad cuts just N. W. of Beartow n, already 
described and figured by Dr. Hayden, in his report on the Geology of 
Wyoming, 1870, p. 150-158. In these, numerous thin strata, horizontal 
on the western end of the exposures, are suddenly decurved and become 
vertical to the eastward, both directions coinciding with those of the 
heavier and higher beds which compose the bluffs and ridges eo 
described. That the whole is an anticlinal with the opposite strata of ¢ 
very unequal dip, is rendered probable by the miniature exhibition seen 
in the section of the lower beds in the railroad cut. 
The Wahsatch beds have been described by Dr. Hz vyden as wanting in 
vertebrate fossils. My assistant, Professor Garman, and myself succeeded, 
however, in discovering a number of species in the upper red and w hite 
strata on the bluffs eleven miles 8. E. of Evanstown, or near the bend of 
Bear River. They occurred here on the upper, and upper middle portions, 
of the exposure. Extending our observations to the ridges of bluffs 
further to the southward, we found the same strata producing similar; 
and in several cases the same, fossils. They appeared lower down on the 
exposures, consistently with the dip of the strata, though a few were 
found near the top of these, also. 
The species obtained were as follows : 
1. Part femur of an ungulate, as large as Paleosyops paludosus. 
2. End tibia of a Perissodactyle mammal. 
3. Notharctus vassacctensis, Cope, sp. nov. 
4, Dermal scuta of crocodile. 
5. Fragments of a Crocodilian, perhaps (. wiphodon. 
6. Fragments of a Trionya, near Tr. guttatus. 
7. Notomorpha testudinea, gen. nov. of tortoises. 
8. 4 gravis, sp. nov. 
9. oe garmantt, sp. noy. 
10. Fragments of an unknown reptile. 
11. Lepidosteus scuta, perhaps like L. glaber. 
2 and 13. Two species of Unio. 
The specimens are all more or less fragmentary, and vary in color from 
nearly white to iron-rust color. The only ones whose specific characters 
are sufficiently preserved for description are those of the new genus 
Notomorpha. The facies resulting from the association of Lepidosteus, 
C 
C. wiphodon and the mammals, is that of the Eocene of the Bridger 
Group on the eastern side of the Wahsatch. The new genus described 
has no Tertiary or Cretaceous rel: utionships ; yet the only Pleurodira yet 
A. P. $.—VOL. XII,—3H 
