Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/339

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These three townships, the most eastern of Juniata county, may be conveniently described together, inasmuch as they are closely related geographically and geologically.

Snyder county lies immediately east of them with the west branch of Mahantango creek for a mutual line.

Monroe and Susquehanna townships border this on the west with Greenwood township filling in the southwest corner, between Monroe and Susquehanna, Delaware township and the Perry county line on the south.

All three townships, taken together, have the shape of a rude right-angle triangle, whose base line, about 12 miles long, is the Juniata-Perry county line along Turkey ridge. The vertical side of the triangle, about 7 miles long, extends from Turkey ridge with but one small divergence to the long line of Snyder and Juniata county, crossing Shade mountain from the Lewistown valley to Mahantango creek between Evandale and Richfield.

Mahantango creek forms a sinuous hypothenuse of this triangle about 36 miles long, the enclosed area of the three townships falling between 40 and 50 square miles.

A large part of the drainage in these three townships is eastward into Mahantango creek, and through that stream to the Susquehanna river south of Georgetown; still an important percentage of the area of Monroe and Greenwood townships is drained southwards through Little Cocolamus creek and its branches, which, after joining the parent stream in the vicinity of Dimmsville in Greenwood township, gaps the Turkey ridge and after flowing directly across the Pfontz valley in Perry county enters the Juniata river about a