PRUDEFOE ISLAHD. 241 



Potters Hotel is located two-fifths of a mile directly west of the light- 

 house. Southeast of the hotel, in the fields, at several localities, some of 

 them halfway down the hillside, occur fairly coarse sandy layers, some- 

 times slightly conglomeratic, accompanying the dark-blue shales. They 

 represent higher horizons in the shale series, and form the highest land 

 surface on the island. Their strike is about N. 10^ E., the dip 80*^ W. 



The strike on both sides of the island, in the section crossing near 

 Potters Hotel, is approximately parallel to the shore. The rocks on the 

 western side dip east, those on the eastern side dip more steeply west, and 

 the general structure of the island is believed to be a syncline. The wash 

 of the waves has cut a bench into the east-dipping shales south of the wharf 

 on the western side of Conanicut (PI XXIII, p. 352). That the rocks on 

 this island have been less metamorphosed than those in Hope Island has 

 already been noticed. 

 3ML0N xxxin 16 



