r88 NEW YORK STATE MUSEUM 



NOTES OX A TRIP FROM PORT JERYIS TO RONDOUT 



BY HEINEICH EIES 



This trip was nudertaken partly to ascertain the conditions exist- 

 ing in this region during the glacial and postglacial period, and also 

 to determine, if possible, whether the estnarj clays extended up the 

 Rondout valley toward Ellenville, as maintained by Darton. 



While niost of the facts noted are rather superficial, as the work 

 was in the nature of a reconnaissance, at the same time they are 

 very suggestive and point to the desirability of farther and more 

 detailed work in this area. 



The monoclinal valley extending from Rosendale to Port Jervis 

 is bounded on its southeastern side (for it runs northeast and south- 

 west) by Sbawangnnk mountain, while on its northwestern side as 

 far as Kerhonkson, northeast of Ellenville, the valley is bordered by 

 the ridge of Hamilton and Marcellus shales and sandstones. 



The valley has been eroded in the Corniferous limestone, rem- 

 nants of which can be seen at several localities, as on Carpenter's 

 point at Port Jervis, and again north of Port Orange. 



This valley from Kingston to Port Jervis and south westward is 

 Postcretaceous. ^ 



Its exact depth is not known, but it was undoubtedly considerable, 

 as at Port Jervis for instance the drift has been penetrated to a depth 

 of 113 feet without striking bed rock.^ 



This drift material consists of sand, gravel and boulders. Usually 

 the pebbles do not exceed a diameter of 8 or 10 inches, and the 

 material shows little or no stratification. 



Subsequent to the deposition of this drift the water flowing 

 down the valley eroded mnch of it, but left more or less along the 

 sides of the valley in the form of two series of terraces. The one 

 coincides with the upper terrace at Port Jervis, the other with the 

 lower one, and this latter above Huguenot forms the broad, flat, 

 bottom of the valley. 



The upper terrace can be traced quite continuously, specially on 

 the northwest side of the valley, as far as Summit ville, at which 

 point the best developments are on the southeastern side. 



1 R. D. Salisbury. Final rep't, N. J. geol. sur. 4: (3) 



2 Rep't G 6, Pa geol. sur. 



