54 
OIL AND GAS; OHIO, WEST VIRGINIA, PENNSYLVANIA. 
sidering it the southward continuation of the one crossing the Penn¬ 
sylvania Railroad at Mansfield, Allegheny County, but since it 
appears to be entirely cut off from that syncline in this quadrangle 
it seems advisable to give that portion which lies within the quad¬ 
rangle and to the south a new name. 
CLAYSVILLE ANTICLINE. 
The next anticline west of the Finney syncline enters the quad¬ 
rangle on its west border within 24 miles of the southwest corner. 
From this point it has a general northeasterly trend, the crest line 
rising and falling in a series of domes and saddles, but continuously 
gaining in elevation northward until it culminates in a high, broad 
dome, the top of which lies in the Burgettstown quadrangle to the 
north of Gretna. This “ high ” covers the northern part of Chartiers 
and Canton and the eastern part of Hopewell townships to a point 
a mile south of Buffalo village, and from it the rocks dip in all 
directions except to the northeast. Between this point and the high 
dome 14 miles north of Claysville the crest line of this anticline is 
very indistinct. These domes are separated by a broad, low saddle 
in which rises a tiny steep-sided dome of only a few. hundred acres 
in extent lying half a mile north of Taylorstown. South of the dome 
near Claysville the crest pitches, with but a single small interruption, 
to the west edge of the quadrangle. 
WEST MIDDLETOWN SYNCLINE. 
1 lie A est Middletown syncline enters the quadrange from the 
north, its starting point being northeast of West Middletown, and 
passes out on the west border near Buffalo Creek. About 1 mile 
north of the last-named location is the bottom of a deep basin from 
which the rocks rise steeply along the trough to the north boundary 
of the quadrangle. From this syncline northwestward the rocks rise 
about 300 "feet before the corner of the quadrangle is reached. 
CONVERGENCE SHEET. 
A number of measurements taken between the Upper Washington 
limestone and the Gordon sand at different points in the Claysville 
quadrangle show that these beds do not lie parallel over any con¬ 
siderable area, but that they converge more or less rapidly from south¬ 
east to northwest. PI. XII is intended to show the rate of this con¬ 
vergence so far as it has been possible to determine it. The foci 
from which radiate straight lines represent wells at which measure¬ 
ments of the intervals between these beds were taken. The differences 
m the intervals shown by adjacent wells are laid off proportionately 
