90 NEW YORK STATE MUSEUM 



member forms a scarp for some distance. The pebbles of the con- 

 glomerate are squeezed out into a stringerlike appearance along the 

 strike. 



At the east this limestone patch gives way to the slates. At the 

 south limestone and slate are somewhat mixed. At the west the 

 patch evidently rests by overthrust on the slate formation. At the 

 north relations are very obscure. It probably dies away along a 

 strike fault. 



Distinct fossil traces were not noted here. The silicious lime- 

 stone often shows many rusty grains. The red slates outcrop less 

 than one-fourth of a mile to the west. 



Farther west, along this north road, about one and a half miles 

 east of Pleasant Valley, as shown on the map, squeezed limestone 

 conglomerate and interbedded silicious limestones form a knoll 

 north of the brook and outcrop along the crossroad leading north. 

 The limestone dies away at the north and is entirely surrounded by 

 the slates. This block is along the line of thrust that brought up the 

 third patch to the south of here along the south road to Moores 

 Mill. 



About two miles southeast of Pleasant Valley is another patch 

 of limestone conglomerate with associated silicious limestone. The 

 latter here is often weathered and shows a distinct clastic rock with 

 fine quartz grains predominating. The weathered surface is pitted 

 and the rock friable from loss of the lime constituent. This rock 

 could be equally well designated as a calcareous quartzite. It is 

 very similar to the rock overlying, or interbedded with, the con- 

 glomerate near Ivy's house farther east, but perhaps is a little more 

 silicious. It carries the same rusty grains. The writer was inter- 

 ested to compare this rock with specimens collected from the Sprout 

 brook limestone near Peekskill and was surprised to note the strong 

 resemblance in texture, mineralogy and markings. 



This patch lies back from the road, about 500 or 600 yards east 

 of J. Fleet's house. It forms a distinct scarp which continues south 

 in the slates along the road after the latter makes its southward 

 turn just east of Fleet's house. A thick band of the red slates 

 comes in between this scarp and Fleet's house and is crossed 

 diagonally by the road. The conglomerate rests by overthrust on 

 the slates at the west. This feature is shown at " Fox Hole," a 

 local name for the precipitous scarp shown in plate 16 and 

 figure 26. 



