OCCURRENCE OF COAL WITH UNUSUAL CONDITIONS 317 
sible. The upper seam is continuous and regular in thickness 
(perhaps ro inches), so far as observation shows, from one end of 
the cut to the other. 
Fic. 1.—View of northwest side of the cut, showing the irregular base of the 
sandstone resting on soft shale. Four distinct shale crests each capped by a coal 
deposit (not visible) and four intervening sandstone-filled troughs with no coal are 
shown. The gentle inclination of the bedding (toward the observer) is wholly obscured 
by the irregular fracture faces of the sandstone. 
Covered 
= 
Shole 
Lewer Mercer Lime 
Fic. 2.—Idealized section of cut, showing relations of various members exposed. 
The vertical scale is much exaggerated, and the inclination of the sandstone is far too 
prominent. The structure near the top of the sandstone is not known. No attempt 
is made to represent the coal pockets at the base of the sandstone as they actually 
occur, although their general relations are correctly indicated. The thickness of these 
coal deposits is also overemphasized. 
The massive sandstone and the upper coal seam can be traced 
for many miles in the region and seldom lose their identity. The 
coal seam at the base of the sandstone, on which interest centers 
