Page:Report on the geology of the four counties, Union, Snyder, Mifflin and Juniata (IA reportongeologyo00dinv).pdf/43

Rh county in this gap it soon cuts off a small end of the Blue Ridge spur, and turns southeast to Mifflintown, across a plain of Clinton and Salina rocks. In the 12 miles between Lewistown and Mifflintown, as indicated by railroad levels, the river falls nearly 60′, or at a rate of 5′ per mile; but a large part of this fall is made through the “Narrows.”

From Mifflintown southeast it meets with nothing to seriously obstruct its flow until the base of Tuscarora mountain is reached, where it is again deflected eastward and finally passes around the end of the mountain east of Thompsontown and into Perry county.

1. The Kishacoquillas creek is its most important tributary in Mifflin county, which with its main branch Honey creek, drains all the Kishacoquillas valley, and a large portion of the Seven mountains area southward to the river at Lewistown. This creek is one of the most beautiful in the district, and by its grand gap in Jack’s mountain south of Reedsville, has afforded a natural location for the Milroy branch railroad and the Bellefonte turnpike.

2. Jack’s creek is another prominent tributary in Mifflin county, rising near the Snyder county line and draining all the upper Lewistown valley between Jack’s and East Shade mountain to the Juniata about a mile below Lewistown.

3. Lost creek, in Juniata county, is the next large stream going south, entering the river from the east about 1¼ miles above Mifflintown. Like Jack’s creek on the north side of the East Shade mountain, Lost creek waters a very large area of southern Juniata south of the mountain to the flint-stone ridge of Oriskany No. VII sandstone. One branch really takes its rise in Snyder county in the Spigelmeyer anticlinal slate valley of No. III between the two crests of Shade mountain, and cutting down through the south crest, enters the Clinton rocks in the valley north of McAllisterville. In a few miles it receives another branch at Oakland Mills, and then flows west along the north base of Lost Creek ridge to the Juniata at the Ciba grist mill.

4. Delaware run is a small stream flowing southwards through East Salem and Thompsontown to the river.