Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/410

382 F³. sentatives of the Chemung rocks. The synclinal seems to contain only the upper Hamilton shales and slates and on the north side of the basin, along Tuscarora creek, large slabs of Hamilton sandstone outcrop on a southeast dip of 40°. The lower Hamilton shales and the Marcellus black slate are exposed north of A. Noss’ house making a bluff along the road on a 25° S. E. dip.

McCoysville is located largely on the Oriskany sandstone measures. The Lewistown limestone at the village is quite massive and has been quarried just below the brick church on a dip of S. 40° E. 45°. The entire series however is somewhat shaly and aggregates about 100′ in thickness.

About one-half a mile east of McCoysville the same beds opened at the village are slightly quarried on the south side of the road on a 40° S. E. dip, but most of the work has been confined to one good bed, from 4′–6′ thick, which, though about the best seen, yields an inferior lime when burned, with a dark gray color, totally unfit for plastering purposes. The cemetery to the east of this point is located on a knob of upper Salina lime shales.

The south side of the township between the Limestone ridge and the Perry county line is entirely occupied by the Salina and Clinton rocks with the Medina sandstone in the Tuscarora mountain. South of Bealetown the upper Salina rocks are first exposed on dips of about 50° N. W., showing best at the mill dam, where too the Bloomsburg red shales are sparingly exposed on the north flank of the Ore ridge.

Probably 300′ or 350′ of brown and olive shales overlie the Ore sandstone south of the old stone grist mill, and the Ore sandstone itself makes a distinct ridge on either side of the creek, showing a brown quartzose rock about 25′ thick on a dip of N. 20° W. 30°. It does not seem to overlie the white Medina sandstone exposed in the anticlinal of Tuscarora mountain further south by more than 200′ which would indicate a considerable thinning of the Clinton rocks in this portion of the field.

The first good exposure of the Medina sandstone shows a