EARLY DEVONIC HISTORY OF NEW YORK AND EASTERN NORTH AMERICA 



69 



in the line of vertical thickness of the strata, at right angles to their 

 present position, is barely enough to admit the beds of Cape Barre. 

 Doubtless they have been largely squeezed out in faulting and pitched 

 over on their side where they now lie, though some part of them may 

 remain in the interval, to be exposed by some favoring neap tide to the 

 eye of the trained observer. 



Perce strata of the Murailles and Barre "brook. Rounding Cape Barre 

 where the dip of the gray limestone and shales is to the north, beyond the 

 first point toward 

 the Blowhole, a sea 

 cavern gnawed out 

 by the waves, the 

 tinted Perce strata 



again appear, but 



hprp b'infy at a Section at Blowhole. Cape Barre beds at left, downthrown Perce' beds at right 



steep angle, 20" to 40° to the southeast and abutting palpably against the 

 thrust plane of a fault which is well marked in the face of the cliff, sloping 

 obliquely downward and to the north. The line of displacement is well 

 enforced by the contrast in color between the downthrown yellow and red 

 strata and the somber grays of the Cape Barre massive. Logan noted the 

 fact that these downthrown strata were of equivalent age and probably a 

 part of the Perce rock, and Ells cites the occurrence in the rocks at the 

 Blowhole of the fossils Spirifer arenosus and S. cyclopterus 

 (probably S; m u re h i s o n i) ; we have also found 



Dalmanites perceensis Leptocoelia flabellites 



Phacops logani Leptostropliia irene 



Acidaspis sp. Chonetes antiopa 



Megalanteris thunei Spirifer arenosus 



Chonetes canadensis S. murchisoni 



and a few others, but the specimens are not very well preserved nor are 

 they in any wise so abundant as at Perce rock. 



These Perce beds about the Blowhole are probably again downthrown 

 in themselves in their further extension along the Murailles but without 



