TWENTY-SEVENTH ANNUAL MEETING. 



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terraces. These are formed by the washing away of the soil down to a layer 

 of limestone and the gradual wearing back of this when exposed. The same 

 process is repeated with the clay and limestone beneath. Thus a series of 

 terraces are formed, each resting upon a layer of limestone and sustained in 

 place by it These terraces are very frequent along the bluffs bordering on 

 the river bank, but are also found further inland. 



