Figure 2a. 1904 Darton photo (#1003) of the "Tensleep and Amsden formations on west side of
Tensleep Canyon, Bighorn Mountains. Looking northeast. Shows Tensleep Sandstone and basal
cross-bedded sandstone of Amsden on Little Horn Limestone." The foreground vegetation, where
Darton's horses are grazing, is mostly sagebrush. The riparian gallery along Tensleep Creek
includes cottonwoods and willows. The larger trees dotting the hillside are ponderosa pine,
whereas the smaller shrubs include Utah juniper and little-leaf mountain mahogany. Darton took
this photograph from a wagon road in Tensleep Canyon.
Figure 2b. 22 August 1998 photo and data taken by Steve Tharnstrom and Julio Betancourt
(Station 99 matches Darton #1003; N44°3.828' W107°22.152'; Washakie Co., Wyoming, 1429 m
elevation). Note that the sagebrush has been replaced by grasses in the foreground and both Utah
and Rocky Mountain junipers. The greatest change is on the hillslope and cliffsides, which are
being invaded by Utah juniper. The wagon road has now been replaced by U.S. Highway 16.