GLACIATION IN THE BIGHORN MOUNTAINS 



221 



two glacial epochs. While most of the gravels seen gave no 

 evidence of being glacial, there is on certain of the hills west of 

 Buffalo, especially on the summit of the mountain locally known 

 as Bald mountain' about six miles west southwest of Buffalo, 

 a deposit of unconsolidated material which has something of a 



Fig. 2. — Section of the drift on the summit of Bald mountain. 



glacial aspect (P, Fig. i). It is made up of bowlders and 

 stones set in a matrix of finer material (Fig, 2). 



All the bowlders, so far as seen, are of igneous or meta- 

 morphic rock derived from the pre-Cambrian core of the range, 

 the nearest part of which is more than a mile west of the locality 

 in question. Most of them appear to have come from the 

 higher part of the range, some 8 or 10 miles away. This 

 material must have come across the intervening Paleozoic beds, 



'There is another Bald mountain about 40 miles northwest of Cloud peak (see 

 Bald Mountain quadrangle). 



