THE BOHsTI^ET, i24o 



almost as far as a very large pegmatite dike about 600 feet north of the 

 South Ferry wharf, just north of which the dip becomes low west. South 

 of this pegmatite dike the low eastward dip continues. 



North of South Ferry wharf occurs a considerable thickness of sand- 

 stone of rather small grain and somewhat bluish color, with black shale 

 higher in the bank. South of the wharf lighter-colored sandstone appears, 

 with very small pebbles and darker, more shaly rock, strike N.-S., dip 

 70^ E. Farther on there is no exposure for a little over half a mile, until 

 the northern end of the Bonnet is reached. 



At the north end of the Bonnet there is sandstone with strike N. 8^ E., 

 dip low east. A very large pegmatite dike occurs at the northeast angle of 

 the Bonnet. South of this dike the strike is N. 8° E., dip 60^ E. From 

 here to the southern end of the Bonnet there is an alternation of sandstones 

 and black carbonaceous shaly rocks. The thickest bed of the black shale 

 has a thickness of at least 40 feet. The strike at the south end remains the 

 same, N. 8*^ E.,dip steep east, near the water's edge as low as 45^; steeper 

 higher on the banks, as high as 60° or 70^. Whether this indicates a local 

 flexure or a syncline toward the east can not be determined. Some of the 

 sandstones are very quartzitic, with much white mica. West of Bonnet 

 Point is a rapid alternation of sandstones and black shales as far as the 

 beach. The frequency of coarse quartz grains in some of the sandstones 

 is noticeable. Strike N. 8° E., dip 60° E. 



At the west end of the beach south of Wesquage Pond, the Carbonif- 

 erous series is exposed again. The beds are here micaceous sandstones 

 with darker layers. The strike is parallel to the shore, N.-S., dip 15° E. 

 The Carboniferous series terminates about 200 feet south of the first 

 exposure, in contact with a very thick, coarsely pegmatitic dike. This dike 

 borders the shore southward for a long distance (Pis. XVIII, XIX, XXV), 

 but about, 1,200 feet north of Watsons Pier it includes small fragments of 

 the Carboniferous sandstone, and almost surrounds a very large mass of the 

 Carboniferous. The dip of this great block is still east. The large area 

 toward the east of the large pegmatite dike which follows the shore is 

 believed to be all underlain by Carboniferous rocks now worn away by the 

 sea and covered by its waters. 



Where the south trend of the shore changes to the southeastward, toward 

 Watsons Pier, the strike brings these hidden Carboniferous rocks again into 



