﻿210 



HAEE INDIANS. 



July, 



either in patches or whole layers. At the upper end 

 of the defile, a fine granular, foliated limestone is 

 interleaved with beds containing madrepores, and 

 parted by seams of carbonaceous matter. Near the 

 middle of the defile the limestone contains the Tere- 

 hratulasphoBroidalis (or a nearly allied species) which 

 is a fossil of the inferior oolite, also some Producti 

 and the coralline named Amplexus. Several seams 

 of black shale, about eighteen or twenty inches 



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Section at the Ramparts. 



thick, exist among the limestones, and rise with them 

 in succession above the level of the water ; but there 

 are not more than two or three of these seams in 

 the height of the clifi^ at any one part. The shale 

 is of various degrees of hardness, and passes into a 

 brownish-black flinty slate. The dip of the beds is 

 not uniform throughout the defile, being more or 

 less undulated, and for some way the layers are 

 horizontal. In places here and there, the limestone 

 beds are excavated into deep pot-holes filled with 

 shale, resembling the gravel pits which dip into 

 chalk beds. 



