134 
ECONOMIC GEOLOGY OF AMITY QUADRANGLE, PA. 
In the Pittsburg, Upper Freeport, and Kittanning seams, especially, 
water is often reported. Several other horizons that are locally 
water-bearing in the Allegheny and Conemaugh are believed to mark 
portions of coal beds. The J. L. Thompson No. 1 well, in the bor- 
ough of Deems ton, was known to have filled up to the surface, 1 ,370 
feet, from an influx of water somewhere near the base of the Alle- 
gheny formation. Water has been found 160 to 175 feet below the 
Pittsburg coal, 220 feet above tin 4 same coal, between the Waynes- 
burg and Washington coals, and nearer the surface, but few shallow- 
horizons are recorded. 
TOPOGRAPHIC DATA. 
McDonald 
TRIANGULATION STATIONS. 
All topographic surveying for the maps of this quadrangle is 
based on fcriangulation stations on a number of the principal hill- 
tops of the territory and its vicin- 
ity. These stations have been con- 
nected by triangulation with sta- 
tions in other portions of the State 
and the accuracy of the work care- 
fully checked. The locations of 
the stations within the quadrangle 
are shown on the topographic map 
by small triangles east of Houston, 
on Mount Wheeler, and at Scenery 
Hill (Hillsboro), and fig. 7 sho wi- 
the relative position of all thi 
points. The stations are marked 
by stone posts, set about 3 feet in 
t he ground, and in the center of the 
top of each post is cemented a 
United States Geological Survey — Penn- 
{JefTerson, 
FlG. 7. Location of triangulation stations in and 
lie it- the Amity quadrangle. 
bronze tablet marked 
sylvania." 
The following is a description of the stations: 
KREPP, WASHINGTON COUNTY. 
About 1^ miles northwest of Brownsville, on a prominent and well- 
known bald knob owned by James Nickson. 
[Latitude 40° 01' 44.55". Longitude 79° 54' 25.69".] 
To station- 
Azimuth. 
Back azimuth. 
Log. dis- 
tance. 
O 1 II 
1 15 13 26. (i 
o i n 
295 07 06.8 
Meters. 
4. 1890430 
