C'OXNECTKTT AND NKW VOKK 37 



Niishua, loniied in the basin oT the Niishiui river by the barrier of the 

 departing iee-sheet.* 



CONNECTICUT 



At Gurleyville, on tlio east side of the Fenton river, a .<2;rou}) of glacial 

 ])ot]ioles, at the height of 98 feet above the river and 42 feet above the 

 highest terraces of valley drift in the vicinity, is described by Professor 

 B. F. Koons, before cited. The one which remains entire, on being 

 cleared from its contents of water and stones, was found to be 6^ feet 

 deep, with a shorter diameter at the surface of 3 feet and 9 inches and a 

 longer diameter of 4 feet and 3 inches. The author notes its unusual 

 form, somewhat like an hourglass, and its relationship to the group as 

 follows : 



" About 2 feet above the bottom the diameter is reduced to about 30 inches, and 

 then widens again below this point, leaving a horizontal ring at the narrow place. 

 What can have been the cause of the forming of the ring at this point is not entirely 

 evident. If the rock were horizontal, it would seem that a hard layer in the rather 

 uniform gneiss would account for it; but, since the rock dips at an angle of about 

 30 degrees and this projecting ring is horizontal and only a couple of inches thick, 

 I find myself at a loss for an entirely satisfactory answer. 



"This pothole is near the edge of the cliff, and the remnants of three others 

 appear upon the face of it, and one of these three shows a diameter of 9 feet and 

 a depth of 6. All are within a few^ feet of each other, a couple of them separated 

 by a thin partition onl3\"t 



Professor James D. Dana mentioned the occurrence of potholes in the 

 gneiss of islands off the Connecticut coast and others on Thimble island, 

 in the bay of Stony creek. J 



NEW YORK 



The earliest published information, so far as I have learned, of potholes 

 in America attributable to moulin torrents was given by Doctor Ebenezer 

 Emmons, in 1842, describing and picturing a very large pothole in Ant- 

 werp, Jefferson county, New York, and noting others near Hammond, 

 in Saint Lawrence count3^ The Antwerp pothole is about three-fourths 

 of a mile south of Oxbow village, and has a height of about 100 feet or 

 more above the Oswegatchie river, which bends in its course at Oxbow, 

 thus giving the name of that village. Only one side of this pothole re- 

 mains. Very probably, as at other places already mentioned, only half 

 of it was worn in the rock, the other half having been the ice of a 

 moulin. The hole is from 24 to 30 feet deep, with a diameter of 12 feet 



♦"Geological History of the Nashua Valley during tlie Tertiary and (Quaternary Periods," Tech- 

 nology Quarterly, vol. 12, December, 180!>, p. 318. 

 t Amer. Jour. Sei., third series, vol. 2.o, June, 1883, p. 471. 

 X Manual of Geology, fourth edition, 1895, p. 940. 



