DETAILED GEOLOGY OF CLAYSVILLE QUADRANGLE. 
153 
layers, separated by shale. (See section, p. 155.) From this place 
the outcrop line of these beds encircles the headwaters of Brush Run, 
the heavy ledges of the limestone being well exposed on the points of 
the hills. In this vicinity the Jollytown coal is overlain by a lami- 
nated sandstone several feet in thickness, which in places is rather 
massive. This is the bed which juts out so prominently on the hill¬ 
sides and which farther to the north, in Mount Pleasant Township, 
strews the tops of the hills with enormous bowlders. 
Upper Washington limestone and Upper Washington coal. —The 
Upper W ashington limestone and coal are present along the higher 
portions of the watershed between Buffalo and Cross creeks. The 
outcrop encircles the high points to the north and northwest of West 
Middletown and the hilltop upon which the village stands, and ex¬ 
tends eastward for a mile or more to the forks of the road going 1 north 
to Wilson Mills. The steep rise of the rocks from this point to the 
Canton Township line brings these beds to the highest" points of the 
ridge. The Upper Washington limestone is here exposed, though its 
lower section is somewhat thinner than it is farther south. The 
Upper Washington coal is represented by less than a foot of soft 
shale, carrying thin layers of coal. The Donley limestone and Finley 
coal were not found in outcrop, though it is possible that they are 
both present. 
CHARTIERS AND SOUTH STRABANE TOWNSHIPS, WASHINGTON 
COUNTY. 
Only the southwestern part of Chartiers Township and the western 
part of South Strabane Township are included in this quadrangle. 
The axis of the Finney syncline lies along the west edge of South 
Strabane and passes through the middle of Chartiers. The rocks 
dip from all points toward this line. Rocks from a horizon about ’ 
35 feet above the Pittsburg coal to one about the same distance above 
the Washington coal outcrop over this area. 
Washington formation. —The Waynesburg “ A ” and “ B ” coals 
are present over most of this area, but are of no importance. The 
Washington coal outcrops in South Strabane Township near the top 
of the high ridge north of Washington. In Chartiers Township it 
was found only in one or two places along the high ridge between 
Chartiers Creek and Chartiers Run. 
Mdnongahela formation. —In these townships the Waynesburg coal 
is thin and unimportant both for mining and as a geologic marker. 
It outcrops a few feet above Catfish Run in the town of Washington, 
and from this point northward it encircles the hills east of Chartiers 
Creek to the boundary of the quadrangle. On the north side of 
Chartiers Creek the crop line of this bed rises higher and higher 
on the hillsides to the borders of the quadrangle. 
