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NP:W YORK STATE MUSEUM 



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have not attempted to enumerate these 

 demoiselles; the number of their su.rmits 

 seems to depend on the angle at which 

 they are viewed. Often one of the larger, 

 seen from ens point, resolves itself into 

 duplicate curves if looked at from an- 

 other. In all the curves are of essentially 

 the same arc, large and small, and their 

 individuality is mere pronounced than on 

 the other islands. 



In respect to their geology these demoi- 

 selles are to be regarded as more pro- 

 nounced expressions of the conditions 

 presented in the volcanic-gypsum belt, the 

 volcanic form herein being developed in 

 topography freer of complication with 

 associated rock masses. Yet it is impor- 

 tant to avoid the conception that there is 

 any real distinction in composition or 

 genesis between this region of hills and 

 the foreland. The sea has cut well into 

 the heart of these demoiselles and the 

 weather has eaten into their surfaces ; 

 and so far as I have observed the vol- 

 canics here are accompanied and often 

 overburdened by gypseous deposits alone. 

 The volcanic n asses are lenses composed 

 of palpably curved layers and it is this 

 curvature inl:o domes with quaquaversal 

 dip that has produced the contours of 

 the hills. The bedding of these masses is 

 sometimes better defined in one part of a 

 given section than in another, and in no 

 case that I have observed is the volcanic 

 mass free of its overburden of gypseous 

 rock save where meteoric agencies have 

 apparently weathered it away and 

 brought to light the crumbling curved 

 top surface of the diabase. So on all this 

 steep eastern shore section of the demoi- 

 selles there are high cliffs of gypse- 



