179. Arch Rocks

 TOWNSHIP: Fermanagh
QUADRANGLE: Mifflintown
LOCATION: In the village of Arch Rock along Arch Rock Road, approximately 2.5 miles north of Mifflintown.

REMARKS: An excellent exposure of an asymmetrical anticline in the Keefer Formation (thin-bedded sandstones and shales, Silurian age).

REFERENCES: Conlin, R. R., and Hoskins, D. M. (1962). Geology and mineral resources of the Mifflintown quadrangle, Pennsylvania Geological Survey, 4th ser., Atlas 126, 46p.

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207. Concord Narrows

 TOWNSHIPS: Lack (Juniata County); Tell (Huntingdon County); Fannett (Franklin County)
QUADRANGLE: Blairs Mills
LOCATION: At the intersection of Juniata, Huntingdon, and Franklin County boundaries; along Pa. Route 75 at Tuscarora Mountain.

REMARKS: A water gap through Tuscarora Mountain is narrow and scenic; talus slopes of Tuscarora quartzite (Silurian age) flank the gap to the edges of the highway. Big Round Top (208), a nearby geologic feature in Perry County, is an erosional remnant of the Tuscarora quartzite atop Conococheague Mountain. Burns Valley Overlook (209) is on Pa. Route 274 at the crest of Conococheague Mountain. Big Spring (210) in Big Spring State Park, is at the base of the mountain.

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229. Hawstone Overlook / 230. Lewiston Narrows

 TOWNSHIP: Milford
QUADRANGLE: Mifflintown
LOCATION: Overlook on the side of Blue Mountain, east of the village of Hawstone on PA Route 333.

REMARKS: An excellent view of the Lewistown Narrows (230), created by the Juniata River between Blue Mountain and Shade Mountain, and the Valley and Ridge province in central Pennsylvania.

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