DESCRIPTION OF PLATES 273 



Description of Plates 



Plate 25. — Views across and along Cow Creek 



Figure 1. — Looking north of west across Cow creek. 



The view is from a point just south of the mouth of Lou creek. 

 Dallas creek is in the far distance to the left, the eastern ex- 

 tension of the Uncompahgre plateau in the distance to the 

 right, the highest point on the skyline being Horsefly peak. 

 The low hills in the middle distance lie between Cow creek and 

 the Uncompahgre river. The mesa to the right is covered with 

 gravels of the intermediate stage; the terrace in which Lou 

 creek has entrenched itself in the foreground corresponds to 

 the level of the outwash deposits of the last stage of glaciation. 

 The photograph is from a hill covered with coarse gravel cor- 

 responding to that of the high plain seen on the right of 

 figure 2. 



Figure 2.— Looking northwest down Cow creek toward its junction with the 

 Uncompahgre river. 

 View is from a point just south of Lou creek. The lowest terrace 

 bordering Cow creek and corresponding to that of the valley 

 train of the last stage of glaciation is shown in the middle 

 distance. The mesa to the left belongs to the old valley surface 

 upon which the early drift and gravels were deposited, and 

 corresponds to the slope on the right which descends toward 

 Cow creek from Cimarron ridge ; both are gravel-covered. 

 Part of the Uncompahgre plateau is shown in the far distance. 



Plate 26. — Uncompahgre Plateau from Horsefly Peak and Ridge extending 



Northward from Latter 



Figure 1. — Looking northwest across Uncompahgre plateau from Horsefly 

 peak. 

 The early drift covering the peak and the neighboring hills is 

 shown in the foreground. 



Figure 2. — Ridge extending northward from Horsefly peak. 

 The ridge is covered with early drift. 



Plate 27. — Looking Southicard from a Point J t miles South of West Baldy 



The mountains to the left are the most northwesterly of the San Juan group. 

 The inclined mesa to the right has exposed u'pon its surface at its highest 

 point traces of ancient landslide debris that is believed to have been derived 

 from the adjoining mountains at some time before the present topography 

 was developed, when the surface of the mesa formed part of a continuous 

 slope from the mountains, which were higher than at present. 



