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UNIVERSITY OF COLORADO STUDIES 



side show the former presence of glaciers. Much of the morainic 

 material was evidently washed away at a later time by the creek. 

 In the lower parts of the park, near the creek (South Boulder 

 Creek), the water table is very close to the surface, as is to be expected. 

 On higher ground a number of wells have been dug which it has been 



Fig. I. — Map of Colorado. Tolland is shown by the star in the north-central part 

 of the state. 



necessary to carry down to depths of 20, 30 and even 50 feet before 

 reaching water. 



The soil everywhere is of granitic or gneissic origin, formed by 

 disintegration of igneous rocks from the adjacent hills and by the 

 grinding of glaciers and the wearing action of running water. Wher- 

 ever a fine-grained mass accumulates it has a more or less stiff and 

 clay-like consistency, but there is generally so much sand and gravel 

 that the soil is typically dry and well drained. 



The present paper is a record of the vegetation at various points, 



