REMARKS: A solid ledge of conglomerate of the Olean Formation (Pottsville Group, Pennsylvanian age) about 51 feet thick. The outcrop is a typical flat-pebble conglomerate that is also known as North Rocks. South Rocks (57), a similar geologic feature, is located about 3/4 mile to the southeast.
REFERENCE: Carll, J. F. (1883), Geological report on Warren County and the neighboring oil regions, Pennsylvania Geological Survey, 2nd ser., Report 14, p. 187.
REMARKS: This site, at elevation 1925 feet, is one of the highest points in the county; a view of High Plateau topography may be seen from the tower. Sandstone Springs (60) is nearby on PA Route 337. Hearts Content Scenic Area is a registered National Natural Landmark.
REMARKS: An area of rugged natural beauty overlooking the Allegheny Reservoir and Kinzua Dam; approximately 600 feet above water level; affords a spectacular view; composed of huge blocks and cliff of conglomerate of the Olean Formation (Pottsville Group, Pennsylvanian age). Jakes Rocks comprises three separate site: North Rock (66), South Rock (67), and Picnic Rock (68). Coal Knob (69) to the south and several "overlooks" between are capped by this conglomerate.
REFERENCE: Carll, J. F. (1883), Geological report on Warren County and the neighboring oil regions, Pennsylvania Geological Survey, 2nd ser., Report 14, p. 187.
REMARKS: A "rock city" of conglomerate of the Olean Formation (Pottsville Group, Pennsylvanian age); joint fractures in the conglomerate have been enlarged by weathering to form the so-called "streets" of the rock city.
This geologic feature is also known as Warren Rocks and Singular Rocks.
REFERENCE: Carll, J. F. (1883), Geological report on Warren County and the neighboring oil regions, Pennsylvania Geological Survey, 2nd ser., Report 14, p. 186-187. of Allegany State Park, New York State Museum Handbook 1, University of the State of New York, Albany, New York, 288p.
Lobeck, A. K. (1927), A popular guide to the geology and physiography
11. Pikes Rocks / 12. Lottsville Rock City / 13. Nuttles Rocks / 14. Brooks Rocks / 15. Baker Rocks
TOWNSHIP: Sugar Grove
QUADRANGLE: Lottsville
LOCATION: About 2.5 miles northeast of U. S. Route 6 near the village of Wrightsville.
REMARKS: The site of a "rock city" on the ridge between Little Brokenstraw and Stillwater Creeks; the rocks rise to an elevation of 1980 feet above sea level. Rock walls of conglomerate rise about 30 feet in height and weather into fantastic profiles. The rock is a massive conglomerate known as the Sharon Formation (basal Pottsville Group. Pennsylvanian age) that contains layers of clear to white, coarse pebbles, some as large as chicken eggs, and has little to no sand matrix. John F. Carll in 1880 wrote about the site (p. 23 in reference below): "It presents mural exposures on all sides, and looks in the distance, whatever point of perspective may be chosen, like the ruins of some Cyclopean structure built by a pre-historic race."
Similar "rock cities," Lottsville Rock City (12), Nuttles Rocks (13), Brooks Rocks (14), and Baker Rocks (15), occur nearby, but Pikes Rocks is the largest and most spectacular.
REFERENCES: Carll, J. F. (1880), The geology of the oil regions of Warren, Venango, Clarion, and Butler Counties, Pennsylvania Geological Survey, 2nd ser., Report III, p. 23-33.
REMARKS: Conglomerate of the Olean Formation (Pottsville Group, Pennsylvanian age) caps "Rimrock"; numerouse small flat pebbles in the conglomerate are of particular interest. A spectacular panoramic view of Kinzua Bay; the site is also known as Sams Rocks (93)
REMARKS: A wide, deeply cut channel of Brokenstraw Creek was dammed during the Great Ice Age in Pennsylvania by a kame moraine during the retreat of the ice. This moraine caused a reversal in drainage direction and the eventual abandonment of the channel. Impervious clays and silts in this ancient channelway underlie Tamarack Swamp and are part of its origin. Poor drainage and great accumulations of organic matter have produced the bog, which is the finest example of a northern bog in Pennsylvania. The swamp is a registered National Natural Landmark.
REMARKS: An outstanding vista of the High Plateaus and the Allegheny River valley.