﻿124 NEW YORK STATE MUSEUM 



the upturned angles of the Perce Rock Devonic ; this too has pre- 

 sumably been separated from the parent mass of Ste. Anne by a 

 fault. 



One additional fact is here worthy of record. Overlying the 

 slopes of Mt Joli, particularly the south flank, is a very thin mantle 

 of a gray unf ossiferous shale, whose attitude is apparently at right 

 angles to those vertical beds. What is present is a mere residuum 

 reduced to little more than a film but it seems to be a remnant of 

 some gray shale that pertained to the Bonaventure series and has 

 been broken up by weather. I would make this intimation with 

 reserve, as it is possible that this thin accumulation has some later 

 origin. 



The vertical rocks. It is in the matter of attitude that the 

 great contrasts of this coastal geology lie. On all the southward 

 stretch from the angle of Mt Joli, the old rocks are but very little 

 out of the perpendicular, standing with an inclination of 8o°-85° s. 

 This is true of all the Siluric shales and thin limestones of Mt Joli 

 and Mt Canon, of the highly colored Devonic of Perce Rock 

 and of the red and white limestones of Cape Blanc. On the north 

 limb of the coast angle these older strata are less uniform in atti- 

 tude and more faulted against each other but all steeply inclined. 

 Throughout the complete series, however, there is a multitude of 

 displacements, to which I have previously given some attention. 

 Denuding these earlier rocks of their overburden, one finds the 

 basis on which to restore the pre-Bonaventure appalachian up folding, 

 which has received its essential shove from the south, as the arm 

 of the great mountain system here curved itself toward the east. 

 All the capes and promontories of the coast lie where the more 

 durable vertical rocks have stood against the sea, while the softer 

 Bonaventure mantle was destroyed. These various Paleozoic rocks 

 and their contents have been already pretty freely discussed by the 

 writer and on this occasion it is desired only to consider somewhat 

 more fully the character of the cliffs at Cape Blanc and their exten- 

 sion into the White mountain. 



The overlap of the red Bonaventure sands and conglomerates on 

 these vertical limestones is beautifully seen on this sea front. Un- 

 fortunately these cliffs are very difficult of access except in a calm 

 sea, for they run sheer to the water with only a little beach here 

 and there north of the cape. From above they are quite out of 

 reach. The northernmost part of the vertical series, especiallv 

 where covered by the red Bonaventure, is deeply stained red and 

 green, but the color has not been derived from the rocks above. 



