DETAILED GEOLOGY OF CLAYSVILLE QUADRANGLE. 157 
Uniontown coal and Benwood limestone .—This group of rocks out¬ 
crops in a small area in Canton Township, in Chartiers Valley north 
of Oak Grove, and up Georges Run almost to Gretna. The rise of 
the rocks in that direction is just about equal to that of the valley, 
the upper portion of the Benwood limestone being at water level for 
almost the entire distance. On the first road turning to the west 
north of Oak Grove occurs tlie only outcrop of the Uniontown coal 
bed known in the township. . The following section, taken along this 
road, shows the stratigraphic position and general appearance of the 
beds: 
Section on road west of the mouth of Georges Run. 
Ft. In. 
* 
Limestone above Waynesburg “ B ” coal___ G 
Coal “ B,” with a thin layer ot' bluish lire clay above and below_ 2 G 
Shale and sandstone carrying one or two tiny coal smuts_ 30 
Coal “A,” mostly shale_ 6 
Shale, yellow, and thin-bedded reddish sandstone_ 3G 
Coal, Waynesburg, mostly shale_ 1 2 
Sandstone, thin-bedded, shaly looking, micaceous_ 10 
Shale, black (horizon of stray coal bed)_ 1 
Clay shale, yellow, and thin-bedded sandstone- 40 
Shale, black, very coarse_ 4 
Shale, brown_ 3 
Coal, Uniontown, coarse, black shale, with carbonaceous shale at bottom- 6 
Limestone, Benwood: 
Limestone, yellowish white, very hard, fractures dark blue_ 1 4 
Shale, yellowish_ 2 
Limestone, yellow and hard, very impure- 2 6 
Limestone, yellowish white, fractures steel gray- G 
Shale, yellow_ 8 
Limestone, yellow -=- 3 
Shale, yellowish_ 8 G 
Limestone, blackish, fractures buff, very hard- 2 6 
Sandstone, thin bedded- 3 
Limestone in several beds, reddish white, fractures steel gray, top 
bed pimply, bottom bed weathers in grooves and fantastic forms, 3 
Clay and shale below to bed of run. 
BUFFALO TOWNSHIP, WASHINGTON COUNTY. 
The Finney syncline crosses the southwest corner of Buffalo Town¬ 
ship, in which a shallow basin occurs northeast of Coffeys Crossing. 
Southward along the bottom of the trough from the rim of this 
basin the rocks dip 50 feet to the south edge of the township. North¬ 
westward from this syncline the rocks rise to the Claysville anticline, 
the crest of which roughly parallels the west border of the township. 
The rocks exposed include those from the Waynesburg coal upward 
through the Washington formation and about 225 feet of the Greene. 
Prosperity and Claysville limestones .—The highest rocks in the 
geologic column of this township occur on the high ridge a short 
distance north of the Sugar Hill tunnel. This is practically in the 
