Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/184

156 F³. the Ore sandstone, the latter rock being well exposed, 20′ thick, and making a distinct ridge from the ravine to Mr. Koster’s barn, which is built upon its ontcrop. The ridge is very low, however, and there cannot be much ore above water level, though some little exploration has been made with a view to locating the Sand Vein and the Danville fossil-ore beds. The underlying Clinton fossil shales are also well exposed between Koster’s and Middle creek on a 10° N. N. E. dip.

Middle creek at Kantz’s mill has eroded a wide basin in these lower Clinton shales, leaving the ore sandstone ridge isolated and prominent to the east in Penn’s township and skirting the north flank of a sharp but low ridge in Washington township, formed by the iron sandstone. Both the ore sandstone and the Bloomsburg red shale fold around the anticlinal axis and recross Middle creek between the village of Kantz and Kantz's mill the two opposing outcrops of the Bloomsburg shale being about 1½ miles apart.

The upper Salina lime shales are very largely eroded through the fertile valley they create in this township, about 2½ miles wide, flanked on either side of the axis by ridges of the Lower Helderberg limestone. These rocks everywhere outcrop at angles not exceeding 15°, so that their erosion has been very even everywhere. These are the same rocks composing the Buffalo valley of Union county, where, owing to the presence of a number of anticlinal and synclinal rolls, they have been spread through a much wider area than they occupy in Snyder county, on both sides of the Selinsgrove arch. A small tongue of these rocks crosses the river into Northumberland county, where, too, there is an excellent section of the overlying Helderberg limestone and Oriskany shales and sandstone exposed in the cuts of the Northern Central railroad.

In Report G7, p. 344, Prof. White gives a detailed section of these rocks upon both sides of the anticlinal, which may be summarized as follows: