Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/395

Rh some slight indication of the presence of the Danville beds here. North of Bratton’s the Bloomsburg red shales occur in a narrow band near the forks of the creek and between this point and Allenville in the trough of the basin there is a narrow band of the Lewistown limestone which does not extend west to this point.

North of Allenville the country is wild and unbroken. The Ore sandstone, however, makes a distinct ridge at some distance from the flank of Shade mountain, so that the dips through here west to Tuscarora township are eminently gentle.

The Academia anticlinal declines also in that direction just as the Shade mountain, or Black Log anticlinal, begins to take new strength and forces its Medina sandstone walls sufficiently apart to receive the Oneida sandstone, as well as the slates and limestone of the Black Log valley.

The opposing outcrops of the Ore sandstone in the Academia anticlinal, a mile apart south of Johnstown and Allenville, converge westward and are little more than one-half mile apart on the Tuscarora township line.

These two townships can be advantageously described together, as they complete the great rectangle between Blue ridge and Tuscarora mountain and the Juniata river and Tuscarora township line.

Tuscarora creek everywhere forms their irregular northern line in common with Milford and Beale townships, except for the short link south of Academia, where the Limestone ridge forms the Beale-Spruce Hill line.

Tuscarora mountain carries the southern border line of both townships, dividing them from Perry county, its long straight crest coursing for about 11 miles in a nearly east and west direction, almost equally divided between each township.

The Juniata river, between Port Royal and Tuscarora Water Station, is the east line of Turbett township, which is further separated from Walker township by a north and south line a mile long, between the Water Station and the crest of the mountain.