300 RECORDS OF POST-TRIASSIC CHANGES 



Blomidon, offering a huge barrier to the advancing ice sheet 

 which would deflect the main current, and leave a sheltered 

 area behind where the eroding action would be small or absent 

 altogether, and the conditions favorable for deposition during 

 the decline and disappearance of the ice. 



This protected area would extend about to Ira Woodworth 

 Bay, whence westwardly the shore would be exposed to the full 

 sweep of the mas- passing to the westward of Cape Split. It is 

 significant that east of this Bay occur the heavy deposits of 

 boulder clay while to the west a bold bare coast of black for- 

 bidding trap extends for a hundred and twenty miles with but 

 an occasional heap of red boulder clay that has been deposited 

 behind some projecting cliff. Have we not here a simple 

 explanation of the preservation of this fragment of marine lime- 

 stone, this mere remnant of what must have been a formation 

 of considerable extent, the sole representative in north-eastern 

 America, containing the only known records for that region, of 

 the Geological history of the long period of time between the 

 Triassic and the Glacial periods. 



Stratified Sand and Gravel. 



But the records preserved in this strip of coast do not end 

 with those of the Glacial period. Overlying the boulder clay is 

 a deposit of stratified sand and gravel several feet in thickness, 

 the base of which is now some thirty feet above high tide level. 

 The upper limit of this formation was not determined, but the 

 coarse and water worn character of the material classes it as a 

 shore deposit., laid down within or but slightly below tidal 

 limits. This formation has been noticed at Wolfville, Pereau 

 and at several localities-- in Digby County. In the Cornwallis- 

 Valley it consists mainly of stratified sands in which the cross- 

 bedding indicates that during their deposition the. currents 

 flowed strongly both to the north-east and to the south-west, or 

 parallel with the general trend of the valley. 



These deposits tell of a submergence succeeding the Glacial 

 period of at least thirty or forty feet and a re-elevation of at- 



