84 The Shoshone Island. 



Silver lake, eastward of Klamath marsh, where 

 finely preserved fossils are so found. 



These two classes of products of volcanic 

 activity have worked together the volcanic 

 flood and the volcanic cloud each doing its 

 part in fashioning the future of the island of 

 Shoshone. 



Yet another feature of great importance 

 in modifying the future of the Shoshone re- 

 gion remains to be described the enormous 

 accumulations of lake sediments that on a 

 lower level completely encircle the old outline 

 of the island. 



All the wash and wear and drift of the 

 land was of necessity toward the lowest places 

 the lake beds of the interior and the sea 

 bed of the coast. The dust of the atmosphere, 

 the sands of the river current, the mud wash 

 of the storm, the wear of the coast line, all 

 these ultimately drift toward the deepest 

 places; and because these deepest places 

 have but little current and only the finest of 

 the muddy sediments go into these current- 

 less depths, it results that deep oozy mud cov- 



