Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/247

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This township, one of the largest in Mifflin county, occupies the extreme northeast corner of the county. Bordering on Center county and Union county, on the north and east, it occupies the extreme eastern end of the Kishacoquillas valley. Its northern boundary is largely formed by the crest of Paddy’s mountain, with a portion of the Long mountain spur in the extreme northwest corner. Jack’s mountain is its southern border, its long straight crest making a high bounding wall, 11 miles in length, and separating this township from Decatur and Derry townships on the south. Brown township lies to the west towards the center of the Kishacoquillas Valley.

Armagh township averages about 14 miles in length and about 6 miles in width, thus giving it an area of about 84 square miles.

Nearly half of its area is occupied by mountain spurs, which, as the map will indicate, take the form of the letter W thrown upon its side, the inside lines being occupied by Strong’s and Beatty’s Knobs, with Paddy mountain on the north and Jack’s mountain on the south forming the two outside and longer strokes of the letter. Between these spurs the three divisions of the Kishacoquillas valley extend like the fingers of the hand, narrowing from the western township line towards Union county, on the east.

These three divisions of the valley are known as the Havise valley on the north, Triester valley in the center, and the New Lancaster valley on the south. All have the same anticlinal structure and are composed of the same rocks, the Trenton and Chazy limestones and the Hudson river slates.