on the west side of Sack’s creek about 40′ thick, and dipping northwest and northeast 35°.
The Goss Bros’. quarry of Lewistown limestone, immediately south of this point, on a conformable dip and on the north side of the creek. This quarry is very small and is opened in the lower portion of the limestone formation where the beds are somewhat slaty and impure. The Painterville gap in this limestone ridge shows a very flat dipping limestone outcrop 60’–70′ thick, capped with a thin covering of the Oriskany sandstone No. VII.
It should be remembered by the people of Decatur township in seeking a development of the limestone measures through this portion of the valley, that the hill facing the creek and the railroad on the north, between Wagner and a point a mile west of Shindel, is not composed of limestone and sandstone at all, but of the No. VIII slate, and consequently they must seek for the limestone further north towards Jack’s mountain. Immediately north of the Wagner tannery in a large sink-hole on the south flank of the Oriskany ridge the No. VI limestone dips 35°, N. W.
30. Derry township in Mifflin county.
This township lies immediately west of Decatur and though of somewhat irregular shape, it has for its main north and south boundaries the same two mountains. The north line along Jack’s mountain is 6½ miles long; but the south line dividing the township from Juniata county only runs along the crest of Shade mountain for about ¾ of a mile, when it is offset in a southwest direction, corresponding to the Juniata county line, and reaches the Juniata river in “the Narrows” about 2 miles west of Grahamville.
The Juniata river forms its south line and a portion of its west line up to Lewistown, where the west line diverges northwards for 2 miles to the Ferguson valley road and is slightly offset there to the west before taking a parallel north course a mile and a half to the crest of Jack’s mountain. The county therefore averages 6 miles in length east
