Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/199

Rh Centre township line, extend for about 300 yards down the ravine largely sandstone, with some beds of shale holding pebbles and bowlder-shaped rocks; in places as large as cocoanuts, At the southern end of the exposure the dip has increased to 30°, to the south of which the Genesee slates show on a 50° dip and finally the Hamilton slates and sandstone at Buffington’s and Shambach’s where the dip has increased to 60°. These same rocks show in detached exposures along roads ascending the ridge further west, where they preserve about the same characteristics.

This township comprises an area of about 15 square miles, lying immediately west of Franklin and north of Shade mountain. Formerly its area was much larger, Adams and a part of Spring townships having been erected a few years ago. These two townships adjoin it on the north and west respectively.

Beavertown is the only village within its borders, situated in the upper Salina valley on the Sunbury and Lewistown railroad about 2 miles east of Adamsburg.

Middle creek is still the only stream draining this part of the county, entering this township from Spring in the Marcellus slate valley in the northwestern corner and cutting its way southeastward through the limestone ridge and into the upper Salina valley along the Franklin township line. It drains the north flank of Shade mountain through several important tributaries, the chief of which are Shipton and Mill runs, the latter passing through Beavertown and making a second gap in the limestone ridge.

The structure of the township, while normally monoclinal and showing northwest dips away from the Shade mountain anticlinal, is modified by several local synclinal rolls, which duplicate the outcrops of the rocks in which they occur. The first of these is a long narrow basin in the Clinton measures between the main ore ridge and the Medina white sandstone, which has preserved in a high ridge south of Beavertown a small circular knob of the Ore sandstone and accompanying fossil ore beds.