The Devonian rocks occupying the valley of the right fork of Middle creek; are everywhere shales and create very few hills. It is doubtful whether any of the Chemung measures are exposed in this township, except, perhaps, along its eastern side south of Port Ann, where a considerable ridge marks the center of the basin showing a somewhat massive sandstone accompanied with shales with converging dips of 25° S. and 30° N.
The right fork of Middle creek flows largely through a valley of Marcellus slates from Port Ann to below Troxelville, and where it turns southward these measures are exposed on south dips of about 40°. Some Hamilton measures show further south towards Beavertown, but without prominent sandstone beds except on either side of the main valley. The central area is largely occupied by the brown and yellow Genessee slates.
15. Penns Township in Snyder county.
This is rather an irregularly shaped township, lying along the Susquehanna river and to the south of Jackson and Monroe.
Penns creek for 3 miles forms a portion of its eastern border line and the river continues that line for 2 miles further south above and below Selinsgrove. The Mill branch of Penns creek forms its north border dividing it from Jackson township, while Middle creek creates an irregular southern border from Kantz’s mill near the Middle Creek township line to the Susquehanna river, nearly 2 miles below Selinsgrove. Its western line is a straight one 3 miles long, between Kantz’s mill and the Mill branch, and its entire area will approximate 15 square miles.
Selinsgrove, the most important town in Snyder county, is likewise the chief place in Penns township, situated on the west bank of the Susquehanna river, just below the mouth of Penns creek and on the Sunbury and Lewistown railroad.
Salem, 2 miles north-west, and Kantz, about 24 miles southwest on Middle creek, are two smaller villages situated in the fertile Middle Creek valley of upper Salina Vc
