, 
752 ON THE GEOLOGY OF THE ISLAND OF AQUIDNECK. 
Over all the section extending from the Bristol Ferry to the 
northern end of Lilly pond, we have a set of rocks which must 
undoubtedly be referred to the carboniferous age, but which vary 
in some regards from the typical rocks of that age in this country. 
The exact thickness and the composition of all the members of 
this series are not easily ascertained on account of the limited na- 
ture of exhibitions of strata on the island. The following section 
is believed, however, to give sométhing like an approximation to 
the truth :— 
erence gotta slates with about six seams of a more 
————-than one foot thick. Some conglomera -—— 
200 to 500 ft. 
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Blue and Greenish Slates. a B 
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eevestue Conglomerates with Black l Carl Shales........ 7“ 
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The thickness of this section is difficult to determine; the nt- 
merous faults which are apparent in the small part of the area of | 
