CHAPTER IV. 
DETAILED GEOLOGY OF THE BURGETTSTOWN 
QUADRANGLE. 
HANOVER TOWNSHIP, BEAVER COUNTY. 
A small part of Beaver County is represented in the Burgettstown 
quadrangle by a strip of land 1^ miles wide along the western half 
of the north edge. The surface of the quadrangle is almost entirely 
composed of the Conemaugh formation. 
Rocks above the Ames limestone .—The Pittsburg coal occurs in 
the ridge along the south edge of Hanover Township, at Frankfort, 
and in the hills a mile north and west of that village. The limestone 
below the Pittsburg coal extends to the ridges beyond the last out¬ 
crop of the coal. The upper portion of the Conemaugh is a sandy 
shale that merges downward into a massive sandstone 30 to 40 feet 
thick, the base of which is just above the Ames limestone, and in some 
places has entirely replaced this valuable marking stratum. 
Ames limestone .—At Murdocksville and along Raccoon Creek to 
the north the Ames limestone is well developed and can be easily 
followed to the north edge of the quadrangle. In this vicinity the 
Lower Ames coal is 14 feet thick and lies directly under the lime- 
stone. A heavy bed of the Ames limestone shows in the main run 
below Frankfort Springs and again in the run in the northwest 
corner of the quadrangle. 
Subsurface stratigraphy .—Very little reliable information was ob¬ 
tained with reference to the conditions below the surface in this town¬ 
ship. Along the east end oil is obtained from the Hundred-foot sand 
and northwest of this pool is a gas field in the same sand. It is 
very doubtful if the Hundred-foot sand continues much farther west 
than this field. 
HANOVER TOWNSHIP, WASHINGTON COUNTY. 
Hanover is the northwesternmost township of Washington County. 
It includes the area west of Raccoon Creek to the north of Smith and 
Jefferson townships and extends beyond the limits of the quadrangle 
to the west boundary of Pennsylvania. Most of the surface of the 
township is composed of the Conemaugh formation, though the high 
hills in all parts include the lower beds of the Mononmahela 
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