290 



RECORDS OF TOST-TRIASSIC CHANGES 



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The general topography of the- 

 region alluded to is probaMy familiar 

 to you all, as well as the common 

 explanation of the geological sti ucture,. 

 which appears to be, in the main, cor- 

 rect. From the parallel east-north- 

 east and west-south-west ridges of 

 slate and sandstone of later Palaeozoic 

 age, which extend along the south- 

 east side of the Cornwall?* Valley, a 

 slightly undulating rich farming coun- 

 try stretches away to the north-west 

 for* some ten miles to the abrupt 

 escarpment bounding the valley on its. 

 opposite side. The principal topo- 

 graphic features of this beautiful 

 valley are three low ridges parallel in 

 general trend with the older hills 



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before mentioned and separated from 

 each other and from the bounding 

 ridges by long tongues of fertile 

 dyked marsh in the basins of the 

 Cornwallis, Canard, Habitant, and 

 Pet eau rivers. The existence of these 

 ridges seems to be due to the occur- 

 rence of coarser harder groups of 

 strata in the underlying red sandstone 

 which dips with considerable unifor- 

 mity and regularity to the north-west 

 at angles of from eight to ten degrees. 

 The ridges correspond with the strike 

 of the formation and the valley topo- 

 graphy is apparently one of erosion. 

 The wearing out of the valleys took 

 place when the country stood at a 

 higher level, and the marsh deposits of 



