28 C. D. WALCOTT ALGONKIAN FORMATIONS OF MONTANA 



been to the west and northwest of the Kootenay valley at Porthill, Idaho. 

 The sediments which extend 300 miles or more to the eastward betray 

 frequent evidences of shallow water deposition, and in the Little Belt 

 mountains indicate that the eastern land area was of low relief and sit- 

 uated still farther to the east, although the presence of a limited land area 

 is shown by the conglomerates at the base of the Algonkian section near 

 Neihart. 



