52 NEW YORK STATE MUSEUM 



road to the Poughkeepsie road, and then continued to the river 

 along the road to the molding sand dock a mile and a half north of 

 Camelot/ and thence along or just east of the track to Camelot 

 station gives all the principal varieties of rock that have been met 

 with north of Stoneco quarry. 



Beginning at the east, south of Kimlin's farm, at the top of the 

 hill on the Spackenkill road, the rock in the ledges is of a light 

 steel-blue color and of medium grain (letter A in the section, fig. i8). 



CHERTY DOLOH 



Fig. 1 8 Section along the Spackenkill road 



It often carries on fresh surfaces markings of calcite, shaped like 

 the segments of various curves, and blackened depressions and pits 

 which have no particular or definite form. Just north of the junc- 

 tion of the two roads at this point on the east side of the road that 

 passes Kimlin's house a brecciated conglomerate was noted re- 

 sembling the Trenton as seen elsewhere in the quadrangle and carry- 

 ing masses that resembled Solenopora compacta. 



The next cut west on the Spackenkill road shows many chertlike 

 masses and scroll effects of silicious material that have weathered 

 out. North of here in the fields of Mr Mulkemus and in the neigh- 

 boring woods the ledges carrying this variety of rock are very 

 numerous and may be traced some distance east and west (let- 

 tered B, fig. i8). 



This rock gives place, near and at the junction with the Varick 

 road, to dull gray ledges of arenaceous limestone which has a coarse 

 sandpaperlike appearance on weathered surfaces. One-fourth mile 

 beyond this, rock outcrops on the north side of the road and lies 

 quite flat (lettered C, fig. i8). The rock at Ruppert's quarry, 

 one-fourth mile farther west (lettered D, fig. i8), in general 

 character is almost identical with that of the two previous outcrops. 

 The rock in the quarry varies in color from black to gray. The beds 

 average thicker at the base and grow thinner toward the top. There 

 are a few shaly layers. The strike of the quarry rock is about 

 n. 75° e. and the dip about io° northwest. 



At the corner of the Spackenkill and Poughkeepsie roads im- 

 pure limestone outcrops on the east side of the latter road with 



1 Camelot station is at the point marked Stoneco on the map. The 

 name Stoneco is usually applied to the Clinton Point Stone Company's 

 quarry, a mile below Camelot station. 



