DOUBLE CREST OF SECOND WATCHUNG MOUNTAIN 45 
is therefore considered to be exactly comparable to Washington Valley, 
between First and Second mountains. It is shallower and the escarp- 
ment of the overlying trap outcrop is less pronounced because of the 
limited thickness of the interbedded shales. 
Evidence of continued depression in the same synclinal region is 
found in the sediments between Second Mountain and the overlying 
trap sheet of Long Hill. There is a decrease of one-fourth in the 
thickness of the intervening shales at Madison, as compared with 
those at Millington, and a much more rapid thinning out toward the 
west. The trap sheet of Long Hill is also thicker about Millington, 
but this may be due in part only to the original inequality of the sur- 
face upon which it was laid. 
