68 ■ NEW YORK STATE MUSEUM 



The presence of the Trenton along the western scarp, as marked 

 by S. compacta, accompanied as it is by a scarp, suggests 

 that it probably is faulted in here. 



Faulted block number 2. Whether this block is distinct from 

 number i might be a matter of interpretation. The house and 

 barns of George Byer are built on the summit of the western scarp 

 of this block which, west of the house, descends abruptly to the 

 level of the present flood plain of the creek. The northern margin 

 ends 100 yards north of the barn. The most eastern outcrop at the 

 north is separated from the ledge, marking the visible western 

 margin of block number i by a shallow gully. The two may unite 

 below the surface. At the south the limestone is lost under the 

 terrace, but it is assumed to continue south for a distance. The 

 slates do not outcrop between its western scarp and Wappinger 

 creek, but as the slates extend well up in this space in the bed of 

 Wappinger creek and west of it they almost certainly underlie the 

 interval where outcrops are concealed. The block is regarded as a 

 dismembered part of the central strip. The slates have been 

 dropped down between the latter and these two blocks at the east. 



Faulted block number 3. The evidence for the presence of the 

 limestone at this point consists of two small detached ledges appar- 

 ently in place, and a scarplike topography. The low hill shown on 

 the map at this place was approached through the fields south of 

 Manchester Bridge station. The northern slope of the hill is made 

 up of drift, but along the wooded western slope a careful examina- 

 tion disclosed a small ledge of conglomeratic rock with a strike of 

 n. 5° w. and a dip of 32° e. The base of the slope is marked 

 by a swamp. A few hundred feet to the southeast is another ledge- 

 like mass of the limestone with nearly the same strike. North near 

 the railroad and east and west outside the cover of the drift and in 

 the fields at the south are low-lying ledges of slate. 



Faulted block number 4. The visible northern termination of 

 this block is on the farm of Mr Rothenburg at Titusville. The 

 limestone forms a conspicuous ledge just southeast of the barn. Its 

 eastern margin may be followed southward as a low scarp across 

 the road where the limestone abruptly disappears under the low- 

 land along Wappinger creek. In places along the eastern margin, 

 and well shown in two ledges just southeast of Rothenburg's house, 

 the apparent dip is about 55 "^ w. and the strike about n. 44° e. and the 

 rock appears somewhat thin-bedded. The western margin is indis- 

 tinct. The hmestone outcrops just under the road bank, where the 

 road turns east, and rests against the slates in the bed of the brook. 



