CAPE COD GEOLOGY 



147 



SQUIBNOCKET 



Along the cliffs that form the greater part of the coast of Squibnoeket, 

 especially at its northeast end, there are obscure traces of beds of red clay that 

 have been considerably disturbed, and perhaps have been reworked, so that they 

 may be more properly classed as Montauk till. 



NASHAQUITSA CLIFFS 



Near the east end of the Nashaquitsa cliffs, in Chilmark, there are expos- 

 ures of Cretaceous clay, both red and white, overlain by white kaolin sand. As 

 seen about two-thirds of a mile west of the east end, these are both gently 

 folded and are apparently overthrust on the older Pleistocene gravels. The last 

 third of a mile shows mostly clay, evidently considerably disturbed and over- 

 thrust on glacial gravels. 



PEAKED HILL PIT NO. 1 



Between the north and middle roads in Chilmark, half a mile south of 

 Peaked Hill, there is an old clay pit that exposes the white clay and the kaolin 

 sand. The pit extends northeastward along the strike of the beds, but its sides 

 have fallen in to such an extent that the structure of the beds cannot be 

 made out. 



ROARING BROOK 



On the northwest shore, about a quarter of a mile west of Roaring Brook, 

 there is an exposure of a Cretaceous bed high in the cliffs. This bed was re- 

 cently worked for kaolin. It includes both white kaolin sand and red clay, and 

 it underlies a thick series of beds of glacial gravel. The strike of the Cretace- 

 ous bed is nearly parallel to the shore. The dip, although it is not at all clearly 

 shown, seems to be toward Vineyard Sound. 



PEAKED HILL PIT NO. 2 



Half a mile east of Peaked Hill there is another old clay pit showing Cre- 

 taceous kaolin sand and clay. This also is badly slumped. 



NORTH ROAD VALLEY 



Northeast of the localities mentioned there are many small exposures of 

 Cretaceous deposits, chiefly in old clay pits along the North Road Valley. The 

 kaolin sand is the most common member exposed in these pits, but beds of clay 

 are also seen. The lignite bed was not seen at any of these places. No Cretace- 

 ous beds are exposed along the shore of Vineyard Sound between Roaring Brook 

 and Norton Point. 



