OUTLETS OF THE ST. JOHN RIVEK. 61 



-and has been blocked (hiring- a period of siil)niergence 

 by the deposit formed in this valley. 



I refer to these two instances to sliow the possible 

 existence of buried subterranean channels in the limestone 

 ridge which may have given passage to more or less of 

 the river-water of the Kennebecasis, and of the 8t. John 

 valle}^, in pre-glaeial times. 



Changes of Level Due to Post-Glacial Faults. 



But there is an element of uncertainty as to the (.-om- 

 |)arative importance of the passage at Drury's cove and 

 that at tlie present outlet, due to a cause Avhich we only 

 lately been led to ai)preciate. This cause, which may 

 have operated at only a late date to close this channel, 

 would have acted by an uplift of the solid rocks at the 

 ])rury's cove pass, such as undoubtedly has occurred in 

 the city of St. John itself since the Glacial period. 



Is is but recently that we have observed the obvious 

 evidence of such movements which exist around us. At 

 our last meeting I called attention to the existence of 

 ]»ost-Glacial faults in and near St. John by which very 

 considerable changes of level in the surface of the land 

 had been elFected since the glaciers disappeared from this 

 region. In one case a change of level to the extent of 

 over five feet can be shown to have occurred in a space 

 of one hundred and fifty feet. This movement was 

 effected by a number of small faults or breaks in the 

 rocks, amounting in all to the displacement above referred 

 to. If the solid rocks could thus be lifted to the extent 

 of five feet in the short space of one hundred and fifty 

 feet, it is quite possible that between the sea and Drury's 

 cove they may have been raised to the extent of fifteen 

 or twenty feet. A rise of the ledge at that cove to 



