THE NEWARK SYSTEM OF NEW JERSEY 561 
the Hopewell fault. It consists of (a) repetition of the strata, 
(6) diversity of structure and topography on the two sides, (c) 
local disturbances, crushed beds, overthrown dips and slicken- 
sides. 
The uplift was on the northwest and was sufficient to bring 
to the surface the base of the Stockton beds and just across the 
river in Pennsylvania, the Paleozoic floor on which the New- 
ark beds rest. East of Headquarters and Sergeantsville, lower 
members of the Stockton series abut against beds of the 
Brunswick series apparently 2600 feet above the base. If we 
accept the thicknesses already given, the throw of the Flemington 
fault near Headquarters is not less than 10,000 feet. 
Half a mile east of Sand Brook village a small fault splits off 
from the main fracture. By it a part of the Lockatong beds of 
the plateau have been downthrown so that they occur to the 
east, and apparently below the Stockton beds. The beds between 
the two faults are much confused in structure. 
Another and larger split fault was observed to branch from 
the main fracture between Headquarters and Dilt’s Corners. It 
crosses the Delaware about midway between Stockton and Lam- 
bertville, and from a cursory examination I am inclined to 
believe that it joins the Flemington fault again in Pennsylvania 
about a mile from the river. The rocks of this block belong to 
the Lockatong and Stockton series with some intrusive trap 
masses. The general dip is south of west, although near the 
faults there is much diversity. The beds on the east and south- 
east have been downthrown relatively to the others. The com- 
bined throw of this fault and the Flemington fault is about equal 
to that of the latter further north. 
Faults of a few feet throw have been noted in not a few cases 
in quarries, railroad cuts and other exposures. In still other 
cases the amount of dislocation could not be determined, but they 
could not be traced beyond the point of exposure, and the throw 
Philos. Soc., Vol. XX XIII, p. 194), the fault has been located several miles from its 
proper position. A similar error is found on the map in Proc. Am. Philos. Soc., 
XXXI, No. 142. 
