346 J. D. Dana—Glacial Phenomena 
The positions of the great bowlders and of the accumulations 
of drift correspond as to the amount of westing with the 
courses of the scratches. 
The larger bowlders of trap and sandstone lie in the western 
half of the New Haven region. Further, they are gathered in 
great numbers, together with thick deposits of till, along the 
hilly western border, and especially the eastern declivity of the 
high border—as if moraine-like in origin. But some bowlders 
of large size occur on the top and eastern declivity of the 
West R 
ern border, and a few are found farther east. 
ne of the largest of the trap bowlders, called the Judges’ 
Cave, lies on the top of the West Rock ridge (at J, a mile north 
of Westville), at a height of about 365 feet, where it was prob- 
ably stranded becanse 25 feet too low in the ice to clear the 
top of the ridge. It is now in a few large pieces, probably 
through the rending action of growing trees, but weighed 
when entire at least 1000 tons. Just a mile west of the 
‘‘ Judges’ Cave” on the Woodbridge declivity, lies a still larger 
bowlder of trap and entire, its extreme length 42 feet, and es- 
timated weight 1200 tons. The spot where it rests is about 
360 feet above the sea-level, and 20 feet below the summit 
beyond it. But a few rods south lies another of 100 tons, and 
Orange, west of Maltby Park. Smaller trap bowlders or stones 
however, with others of sandstone are widely distributed for 
three to six miles in that direction; onthe south they reach be- 
d* 
yond Milford. 
The course of travel of some of these great bowlders can be 
made out quite closely. They were derived either from the 
determi y (1) the angles of the two slopes, (2) the angle between the dip- 
directions, and (3) the thickness of the overlying glacier. (Th city was too 
luded. me variations in the direction of scratches 10 & 
” 
ock ridge, which is one to two miles east of that west- 
