Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/392

364 F³. line, dipping S. 35° E. 60°. The Oriskany sandstone, here largely chert, making the crest and south flank of the Limestone ridge, is largely eroded along the creek between Port Royal and the point south of Academia, although well exposed at individual points.

Near the Beale line, a little north from Tuscarora creek, there is a fine exposure of the upper Salina Vc′ measures at John Robinson’s house, dipping 50° S. E. and exposing between the two main roads an excellent series of lime shales, gray and blue in color, and very calcareous. These lime shales seem to have a greater thickness, solidity, and a greater number of good limestone beds in this part of the region than elsewhere, rendering it exceedingly difficult to limit the horizon of the still more massive Lewistown limestone measures. The red bands begin to come in between lime shale layers east and west along the main road above Robinson’s house; but the body of the Bloomsburg red shale evidently lies along the flank of the ridge north of the road.

Along the township road, between Beale and Milford, the Ore sandstone in the south leg of the Academia anticlinal shows about 10′ thick, crossing just back of U. Sasner’s house, dipping 30° S. E., but without visible fossil ore. Both this ravine and the one north of Robinson’s should be good places to prospect for the Sand Vein ore beds; for the ridge is unusually high and solid, except where it is cut down by these ravines, and offers good stoping ground and other advantageous circumstances for development by drifts along the strike of the bed for any ore that may be found there.

The Iron sandstone outcrops further north along the township road, making the bed of the road and ravine for some distance as they ascend the ridge on a southeast dip of from 10° to 15°. It shows a dark reddish-brown sandstone, weathering into an iron-brown sandy soil, like trap in color, and breaks in rectangular flat blocks. This rock makes the crest of the anticlinal along the ravine; but on either side of the road the hill rises to higher elevations and