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NEW YORK STATE MUSEUM 



It will be seen from the foregoing that the Perce fauna is more 

 sparse than that of Grande Greve and that some of the species 

 extremely abundant there, e. g-. E a t o n i a p e c u 1 i a r i s, 

 Hipparionyx proximus are absent here, while here 

 Chonetes canadensis, Leptocoelia flabellites 

 are profusely developed. Again striking species in each fauna are 

 absent in the other, while there remains a number of most character- 

 istic species common : Rensselaeria ovoides van, M e - 



S%^ 



The ragged sky line of the Murailles 



gala Uteris plicata, Beachia, Spirifer arenosus^ 

 S. murchisoni, etc. 



There is thus a difference in the relation of the elements of the 

 faunas to each other and also to those of New York. Hence there 

 may be in these faunal characters a reason for regarding these lime- 

 stones as the expression of a distinct substage in the deposition 

 period of the Grande Greve beds. 



On the Murailles or the high rock wall above the North cove we 

 find Perce strata again. Rounding Cap Barre where the dip of the 

 gray limestones and shales is to the north, beyond the first point to 



