REMARKABLE BOWLDERS, 341 



6,000 tons. If allowance be made for an immense fragment which 

 has fallen from its northeast side, the dimensions and cubic con- 

 tents of " Sheegan " would approximate more closely to those of the 

 Madison bowlder. One point that goes far toward substantiating 

 the claim on behalf of the " Sheegan "' rock that it is a true bowl- 

 der, is the number of undoubted bowlders of an immense size and 

 of the same granite which exist in comparative proximity. One, 

 about a mile northwesterly, measures 21 feet high, 25 feet long, 

 and 25 feet thick. Another, some three miles southeasterly, and 

 but a short distance west of the Waterford station, on the New 

 London and Northern Railroad (Fig. 2), and whose existence has 



Fig. 2. 



heretofore been only locally recognized, has almost the same 

 dimensions ; with the added peculiarity of a cavity, or rather tun- 

 nel, at its base, some five feet or more at the entrance, and extend- 

 ing with diminishing dimensions completely through the whole 

 mass of the rock, which is about 25 feet in thickness. This cav- 

 ity, which is somewhat imperfectly shown in the accompanying 

 picture, is of such capacity that it has been fitted up with a cook- 

 ing-stove, and has served a tramp family as a summer residence. 



But one of the most curious and instructive examples of the dis- 

 ruptive and motor power of moving ice during the Glacial period 

 to which attention has ever been called, occurs on the line of the 

 New London and New Haven or " Shore Line " Railroad, about 

 midway between Guilford and Leet's Island stations, and about a 

 mile and a half from either place. Here, on the top of a narrow 

 ledge of rock, which might almost be characterized as a pinnacle, 

 rising (nearly perpendicularly from a salt marsh, or swamp, on 

 one side) to a height of about GO feet, rests a rectangular, sar- 



VOL. XL. — 26 



