PHYSIOGRAPHIC DEVELOPMENT IN COLORADO 131 



They have the appearance of having been the melting basins of ice 

 which gathered from the surrounding highlands. The appearance 

 of peaty beds in the soil of Cedar Park adds to this evidence although 

 no true till has yet been recognized from the area. 



2. Remnants of early till. — ^There are remnants of early till exposed 

 along the roadside at the east end of Mont Rose Valley. This till 

 is made up of granite bowlders, with rounded and scored surfaces, 

 buried in a matrix of bluish clay. The whole is overlain by strati- 

 fied beds of sand and clay topped by coarse gravels. 



Fig. 4. — Cedar Park — probably the melting basin of glaciers which centered 

 around Storm Peak in the distance. 



Small patches of glacial bowlders and terrace gravels lie about 

 50 feet above the river on a rock terrace at Cedar Cove. They 

 are probably remnants of more extensive glacial deposits belonging 

 to the earlier ice invasion. River erosion since ice occupation has 

 re-worked these deposits — carried off most of the lighter sands and 

 rock flour, leaving only the larger bowlders perched above the pres- 

 ent course of the river, which has intrenched itself in recent times 

 from 50 to 100 feet below the old glaciated floor. Recent talus 

 and slumpings may have covered most of the drift remnants which 

 might be expected to remain along the sides of the valley east of 

 Drake. In the Estes Valley, no true till remnants remain, but 

 terrace gravels of water-worn glaciated pebbles perch about 100 



