REMARKS: An eroded plunging anticline of Tuscarora quartzite (Silurian age) has a large topographic basin (Big Kettle) on the lee side of the plunging "nose." Treaster Kettle (188) and Little Kettle (189) are similar features nearby. Chestnut Spring (190) and Ross Spring (191) issue from the base of the quartzite ridges; springs are common in the Kishacoquillas Valley south of Big Kettle.
REMARKS: This "knob," an erosional feature of the weather-resistant quartzite of the Tuscarora Formation (Silurian age), is one of the highest topographic locations in the county. It provides an excellent view of the Appalachian Mountain section topography.
REMARKS: The Ridgeley Sandstone Member (Old Port Formation, Devonian age) has been eroded to produce isolated pillars.
REFERENCE: White, I. C. [1885], The geology of Huntingdon County, Pennsylvania Geological Survey, 2nd ser., Report of Progress T3, p. 215-216.
282. Trough Creek Gorge / 283. Balanced Rock / 284. Ice Cave / 285. Copperas Rock
TOWNSHIP: Todd
QUADRANGLE: Entriken
LOCATION: Trough Creek State Park, approximately 2 miles north of Pa. Route 994 near Newburg.
REMARKS: A deeply intrenched stream flows through horizontally bedded, yellow-brown sandstones, siltstones, and conglomerates of the Pocono Formation (Mississippian age) in a synclinal basin. The gorge has waterfalls, spectacular cliffs, meanders, and geologically interesting Balanced Rock (283), Ice Cave (284), and Copperas Rock (285).
REFERENCES: Wilshusen, J. P. (1969), Trough Creek State Park: Ice mine and balanced rock, Pennsylvania Geological Survey, 4th ser., Park Guide 1.