244 
[Assembly 
Other lines of fault are seen at Lawrenceville, and which may be 
traced to cliffs' on the Shawangunk. Near Lawrenceville, the lime- 
stone beds may be seen downheaved, and abutting against the Shawan- 
gunk grit (which underlies) by successive faults. 
A disruption, or double line of fault, with an included anticlinal axis, 
may be seen between the upper end of Lawrenceville and the bridge 
across the Rondout, on the road to High-Falls. It extends south 20° 
west, to the gap on the Shawangunk mountain, where the same ap- 
pearance presents itself, and which can be seen on the opposite side of 
the mountain from many parts of Orange county. 
Various sections and diagrams will illustrate these and numerous 
similar facts in the final report. 
Pyritous Stratum. 
This rock has but a small thickness in the counties under exami- 
nation, but in other parts of the State it becomes an important rock, 
the equivalent, it is believed, of the " gypseous deposit" of Prof. Va- 
nuxem, in the central and western parts of the State. Its geological 
position in Schoharie, Greene, Ulster and Sullivan counties, is next 
below the " water limestone series," (lower part of the Helderberg 
limstone series,) and above the red and green shales that overlie the 
Shawangunk grits. No beds of gypsum have been discovered in con- 
nexion with this stratum in any part of its range in the 1st geological 
district, but where the lower beds of the water lime series are pyritife- 
rous, as they frequently are, this material might be used with the same 
useful effects as would be obtained by the use of gypsum. 
At High-Falls on the Rondout, in Marbletown, Ulster couunty, this 
stratum, which is there a slaty bluish limestone, occurs above the red 
shales that overlie the Shawangunk grit. The following is a section 
of the rocks at that place, above the bridge, and near the bend of the 
creek, on its left bank below the falls. 
1. Cement rock, 12 to 15 feet. 
2. Limestone, 10 30 
3. Cement rock, 6 8 
4. Pyritous slaty limestone, 4 10 
5. Red shale Avith green spots, containing nodules and 
crystals of pyrites, and thin bands of gray com- 
pact limestone, * 15 20 
6. Conglomerate or Shawangunk grit, unknown thickness. 
