GOAT ISLAND AND LITTLE LIME ROCK. 309 



ern end of Coasters Harbor Island. The arkose is of Carboniferous age. 

 The greenish rocks south of this line are supposed to be of pre-Carbon- 

 iferous age. 



In the light of this interpretation attention may be called to the facts 

 that a north-south line along the middle of Mackerel Cove probably 

 separates the pre-Carboniferous granite from the Carboniferous Conani- 

 cut shales on the westward, and also that a line extending along the 

 western margin of the land, just offshore from Coasters Harbor Island, to 

 the end of Long Wharf, and thence more east of south, east of the Spindle 

 or Little Lime Rock to the southeast corner of Newport Harbor, then 

 southeast, east of the granite exposures in Morton Park, south of Newport, 

 and along the middle of Almys Pond, represents the dividing line between 

 the pre-Carboniferous rocks on the west and the Carboniferous series on 

 the east of this line. Thence the line extends eastward north of Sheep 

 Point. All of these lines are believed to be due to faulting. 



GOAT ISLAND AND LITTLE LIME ROCK. 



The pre-Carboniferous green shales 1 have been reached in deep wells 

 on Goat Island, and they occur on Spindle or Little Lime Rock, and they 

 occur again as a series of rocks following each other in a north-south direc- 

 tion which are exposed at low tide southeast of Lime Rock. The dip and 

 strike of these exposures were not carefully investigated, there being no 

 means at hand of distinguishing' cleavage from real stratification. 



FORT GREENE. 



South of Fort Greene Park carbonaceous black shales are well exposed 

 along the shore. They are banded here with thin layers of a whiter, 

 sandy rock, recalling the thicker interbedded white rock on Bishop Rock 

 and on the west side of Coddington Neck. Thin seams of coal, or at least 

 of very coaly shale, are said to have been struck at various times in the 

 cemetery a quarter of a mile east of Fort Greene Park. 



MORTON PARK AND SOUTHWARD. 



Granite is well exposed in the western half of Morton Park. Toward 

 the southeastern end of the grounds sandstone and blue-black shaly rock 

 are seen striking east of north and dipping steeply westward. A better set 



1 The author does not distinguish between shales and slates or phyllites in this part of the report. 



