180 GEOLOGY OF THE NARRAGANSETT BASIK 



from South Attleboro to Hebronville. These beds probably represent the 

 horizon of the Seekonk group on the north side of the Perrins anticline. 



BLAKE HILL FAULT BLOCK. 



The gray Carboniferous strata west of Plainville in Blake Hill exhibit 

 several small monoclinal ridges of hard sandstone and quartzose conglom- 

 erate with interbedded shales, here and there containing casts of calamites 

 and rarely other members of the Carboniferous flora. The most prominent 

 of these ridges has received the name of " Coat Rock." A detailed meas- 

 urement of the strata exposed in this bluff above the talus has been made 

 bv Mr. F. C. Schrader, to illustrate the character of the barren beds in this 

 section : 



Section of Goat Rock Cliff. 



Feet. Inchea. 



Gray sandstone (at top) 9 



Conglomerate, gray, coarse, with irregular partings of black slate about 



2 feet from base 12 



Shale, dark and slaty 8.5 



Sandstone, gray, varying to a pebbly grit i 1 



Shale, dark and slaty 2 



Sandstone, gray, with a few small pebbles in middle of the layer 11. 5 



Grit, fine, pebbly 3. 5 



Sandstone, grading downward from above 4 



Sandstone, hard, fine grained 5. 5 



Shale, slaty, with plant stems 1 10 



Sandstone, very fine grained 1 1.5 



Shale, slaty 2 



Grit, gray and finely conglomeratic 11. 50 



Shale, dark slaty 11 



Sandstone and grit 8. 50 



Conglomerate, gray, gritty, and grading upward into next above 7 



Sandstone, gray 2. 5 



Shale, slaty 7. 5 



Sandstone, bluish gray 11 



Shale, black and slaty, with plant stems 3 



Conglomerate, fine, gray, and gritty 1 8 



Shale, dark and slaty, a mere layer .2 



Sandstone, gray 5 



Shale, dark, slaty .2 



Sandstone, gray .5 



