CENOZOIC HISTORY OF WIND RIVER MOUNTAINS 153 
the Tertiary, and are not to be confused with the Table Mountain 
gravels to be considered later. 
Beyond the fact that the drainage was to the Wind River and 
the Sweetwater, little is known of the stream courses of the time. 
The Beaver may have flowed out, as today, south of Sheep Mountain, 
or, more probably, by a longitudinal stream north toward Lander. 
PLAINS-REMNANTS ON THE EAST SIDE OF THE CENTRAL WIND RIVER 
MOUNTAINS 
The Table Mountain Level, or No. 2.—None of the plains which 
have been described about the south end of the Wind River Range 
extend continuously north along the east side of the range. There 
are found, however, along the front of the range, isolated gravel- 
covered flats, at levels which correspond with those farther south. 
As careful study as conditions allowed makes it practically certain 
that these flats correspond to either No. 2 or No. 3 described above; 
probably to No. 2. The vertical distance between No. 2 and No. 3 
is only 300 feet, and in many places No. 2 grades up into No. 3, 
so that the attempt to carry either plain north and to connect it 
with the gravel flats is difficult; especially in the absence of topo- 
graphic maps and under the necessity of carrying the lines by eye 
from points of view some miles off the front of the range. Pro- 
visionally, however, these gravel flats, of which the best known is 
Table Mountain near Lander, are correlated with Plain No. 2, 
which has already been called the Table Mountain plain. 
The southernmost of these flats is that which occurs (Fig. 3, A) 
where the Lander—Atlantic City road crosses from the headwaters 
of Twin Creek to Red Cafion Creek, a tributary of Little Popo- 
Agie River. Here a terrace (7,100 feet), cut on the Red Beds, is 
covered by a deposit of gravel to a thickness of 50 to 100 feet as 
shown on-the north slope toward Red Canon. The bowlders seen 
over the surface are commonly less than one foot in diameter though 
some reach a foot, and a few are somewhat larger, but down the 
north face of the terrace loose bowlders up to six feet in diameter 
are met with. The bowlders are Paleozoic and crystalline rocks of 
the foothills and main range, and must have come directly from the 
range as no Tertiary beds are in position to act as an intermediary 
