48 NEW YORK STATE MUSEUM 



THE WAPPINGER (BARNEGATE) LIMESTONE 

 This formation appears within the quadrangle in two main belts 

 with some smaller faulted masses lying between them. The west- 

 ernmost main belt is the Barnegate limestone of Mather/ but now 

 commonly referred to as the Wai>pinger creek or New Hamburg 

 belt. It is followed by Wappinger creek from the latter's source 

 near Pine Plains to the Hudson river, and its eastern contact with 

 the overlying " Hudson River " formation crosses the river at New 

 Hamburg. The eastern belt is known as the Fishkill limestone, 

 as it lies chiefly in the town of old Fishkill. 



THE WAPPINGER CREEK BELT 



This belt enters the quadrangle from the north at Pleasant Valley 

 and continues in a southeast by south course to New Hamburg. 

 It reappears west of the Hudson and continues in the same direc- 

 tion beyond the western boundary. East of the Hudson it is broken 

 up into a central strip, with a large rectangular strip on the west 

 of this along its southern half and separated from it by a narrow 

 band of the slates, and several smaller masses lying to the east of 

 the central strip along its middle portion. 



THE WESTERN STRIP 



Boundaries. This strip is clearly faulted against the slates at 

 the north. The fault line runs in a southeast-northwest direction 

 across the Poughkeepsie driving park. The western contact is 

 marked at many places by swamps or scarps which indicate that 

 the western margin is also a faulted one.- The presence of a fault 

 along here receives confirmation from the apparent age of the lime- 

 stone in contact with, or in proximity to, the slates. The western 

 boundary begins just southeast of the junction of Hooker avenue 

 and the road that runs southward from it on the west of the driving 

 park and passes across the northwestern part of the Ruppert farm 

 and just west of the old Hinckley house, and then may be traced 

 by swampy ground or a lov/ scarp to the schoolhouse at the corner 

 of the Spackenkill and Poughkeepsie roads; thence under drift to 

 the first road leading to the river. The limestone outcrops on the 

 north side of this road in low-lying ledges and in more conspicuous 

 ones south of it in proximity to the slates. From here the contact is 



1 Geology of the First District, 1843, p. 410. 



2 This fault was described by Professor W. B. Dwight. See Amcr. 

 Jour. Soi^ Feb. i?S6, 31:125-37, with map. 



