16 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 134 
the outcrops of the Hendry Ranch member. Some part of the inter- 
mixed volcanic and clastic material in the Clear Creek Basin (fig. 6), 
for example, undoubtedly is equivalent to at least part of the Hendry 
Ranch member. 
Age.—The age of the Tepee Trail formation in the northeastern 
part of the Wind River Basin is considered to be middle(?) and late 
Eocene. The Hendry Ranch member has yielded a fauna that is late 
pT 
(Structure in pre-Tertiory rocks not shown) X5 exaggeration 
Cleor Creek 
lear Creek 
Badwoter Creek 2 | 
(Structure in pre-Tertiory rocks not shown) X5 exoggeration 
Fic. 6.—Cross sections along Clear Creek Valley (D’-D) and along ridge parallel 
to ae 1 mile northwest of Clear Creek (C’-C) showing Tepee Trail formation filling 
valley. 
Eocene in age and suggests equivalence with an upper Uintan stage 
according to Gazin (see Part 2). The green and brown member has 
not yielded many or very well preserved fossils but those that are 
known, according to Gazin, also are late Eocene in age. Locality lists 
of vertebrate and invertebrate fossils from the Tepee Trail forma- 
tion in the northeastern part of the Wind River Basin are shown in 
table 1. Tentative assignment of a possible middle Eocene age to the 
lower part of the Tepee Trail formation is based upon the absence of 
recognizable rock sequences yielding middle Eocene fossils in the 
northeastern part of the Wind River Basin and upon the relation of 
the Tepee Trail formation to underlying rocks in adjacent areas. 
The type Tepee Trail formation in the Absaroka Range lies uncon- 
formably upon the Aycross formation, the type area of which has 
yielded middle Eocene fossils (Love, 1939, p. 70). In exposures on + 
