234 



wide, with two detached half-tide ledges on the eastern end, 

 making the extreme length SOO feet. The two small bays in- 

 denting the western shore correspond to depressions crossing the 

 island parallel with the strike and due, no doubt, to the erosion 

 of the softer strata. Connnencing with the lowest or most 

 northerly beds, the island presents the following section : — 



Conjiloinerate, coarse lo inediuin, 100 feet, e(iuul to tliickiiess of (JO feet. 

 Concealed, probably slate, ;>5 " " " " "20 " 



Conglomerate, medium to line, 170 " " " " "100 " 



Streak of sandstone near tlie northern edge. 

 Concealed, probably slate, 70 " " " " "40 " 



Conglomerate, 00 " " " " "35 " 



435 255 



Along the north side of each depression there is a dike of 

 uncertain width, the north dike having a northerly hade of 15° ; 

 but it is improbable that tiie depressions are due wholly or 

 even chiefly to the erosion of the dikes. Langlee Island is 

 separated by about 600 feet of water from Sarah Island, an 

 oblong mass 275 feet in breadth and 835 feet in extreme length, 

 with a long, half-tide ledge about 100 feet from and parallel 

 with the south shore. It is constituted as follows, in ascending 

 order : Sandstone, gray and coarse, 85 feet, equal to thick- 

 ness of 50 feet, with a streak of conglomerate near the middle 

 of the bed. Conglomerate, medium to fine, 190 feet, equal to 

 thickness of 115 feet, with a streak of sandstone near the 

 northern edge. Water, probably concealing sandstone and 

 slate, 75 feet, equal to thickness of 45 feet. Conglomerate, 

 forming half-tide ledge. 



West of Sarah Island, with about 800 feet of water interven- 

 ing, is Ragged Island, 285 feet in breadth and 785 feet in 

 extreme length, with two linear ledges parallel to the southern 

 shore and 100 feet distant. These two islands are thus 

 essentially similar in form ; and they present identical sections, 

 except that in the depression south of Ragged Island a little 



