THE ACADIAN TRIASSIC 



SIDNEY POWERS 

 Troy, New York 



PART III 



STRUCTURE OF THE ACADIAN TRIASSIC 



The Newark rocks in the Acadian area exhibit a monoclinal 

 structure, with a prevailing northwesterly dip, interrupted by 

 broad, low folds. The monocline is broken by numerous faults 

 with a small displacement and by occasional faults with a displace- 

 ment of hundreds of feet. The other areas of Newark rocks have 

 undergone deformation of a similar nature, but the direction of the 

 monoclinal tilting differs in the various areas. In the case of the 

 Connecticut Valley, the Pomperaug Valley (Connecticut), the Deep 

 River (North Carolina), and the Wadesborough (North Carolina) 

 areas, the dip is southeast, where as in all the other areas it is 

 northwest. 



The two structural features, the folds and faults, will be treated 

 separately and finally some attention will be given to the theories 

 of origin of this structure. 



FOLDS 



The most important and the most conspicuous fold in the 

 Acadian area is that shown by the hook in North Mountain which 

 incloses Scots Bay. The point of the hook forms Cape Split, and 

 the back of the hook, Cape Blomidon. This syncline pitches down 

 on the north side and is cut off on the north by a fault shown in 

 cross-section DD, Fig. 28. The syncline is shown principally in 

 the North Mountain basalt which dips toward Scots Bay on all 

 sides of the Bay at angles of about 5 . Under the basalt flows the 

 Blomidon shale is seen following the erosional escarpment, on the 

 south side of North Mountain, around to Cape Blomidon, near 

 which point it disappears under the waters of Minas Basin, as 



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