COAL. 
89 
crops at railroad level. Well records show that the bed is present in 
all parts of the quadrangle. West of Chartiers Creek it reaches nearly 
a mile up the tributary valleys between Meadowlands and Houston. 
On Peters and Chartiers creeks it can be developed by drifting, but in 
the greater part of the quadrangle it is far below the surface and can 
be reached only by shafts. At Washington it is about 450 feet below 
the valley, at Linden 250 feet, at Wylandville 350 feet, at Lone Pine 
350 feet, at Ellsworth 270 feet, at Zollarsville 350 feet, at Sunset 550 
Fig. 4.— Map showing area of the Pittsburg coal bed in Pennsylvania. 
feet, at Hackneys 500 feet, and at Tenmile village 400 feet. The 
method by which the approximate depth of this bed can be deter- 
mined from the map is explained under the heading " Structure" 
(pp. 36-37), and its variation in level beneath the quadrangle is shown 
on the geologic map (PI. I, pocket). 
MINING OPERATIONS. 
In the Amity quadrangle there are 13 working mines, as follows: 
Ellsworth Nos. 1, 2, 3, and 4, Manifold, Meadowlands No. 1, Rich Hill, 
