204 



Conglomerate. 



Amygdaloid, extending to the shore of the cove. 



The synclinal between these two large masses of amygdaloid 

 is quite narrow as regards the slate, which shows a north-east 

 strike and nearly vertical dip. These are the same beds as 

 those mentioned in the first part of the preceding paragraph, the 

 syncline changing to a faulted monocline, as the strike shifts 

 toward east-west ; and, comparing this stratified belt with that 

 west of Downer Landing, we see that two synclinals are 

 swerved and broken by the eastern extension of the main mass 

 of amygdaloid. 



Along the east side of Hewitt's Cove the amygdaloid comes 

 very near the water, but enough conglomerate and slate in- 

 tervene to afibrd several interesting sections. The strike is 

 N. 25°-30° E,, and the dip westerly, or away from the amyg- 

 daloid, and steep — 60° and upwards. The slate is of a uniform 

 gray or grayish-black color, distinctly stratified, and in part 

 very beautifully jointed. At the south side of the cove the 

 slate rests against the amygdaloid, and is somewhat altered 

 near the contact. Immediately north of this is the following 

 section from east to west : amygdaloid ; concealed, forty feet ; 

 conglomerate, passing into slate, twenty feet; slate, forty feet. 

 The next section, one hundred feet farther north, shows slate in 

 contact with amygdaloid, no conglomerate visible. The amyg- 

 daloid here has clearly experienced some extravasation. Fifty 

 feet north of this gives the following : amygdaloid ; slate, with 

 layers of sandstone and pebbles, fifty feet. One hundred and 

 fifty feet beyond, the apparent succession is as follows : 

 amygdaloid; not exposed, twenty feet; slate, twenty feet; not 

 exposed, probably concealing fault, sixty feet ; slate and sand- 

 stone, fifteen feet ; conglomerate, forty feet. This conglomerate 

 is in part very coarse, holding boulders one to six feet in 

 diameter, which are composed chiefly of amygdaloid, petrosilex, 

 and granite. I observed in it one mass , nearly a foot in diameter, 

 of gray limestone, somewhat crystalline. Along the north side 

 of the cove the section is more extended, including perhaps 



