The Geology of the Pothole

The Geology of the Pothole (HM26KF)

Location: Archbald, PA 18403 Lackawanna County
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Country: United States of America
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N 41° 30.712', W 75° 34.441'

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"It is a fine case of a well-known phenomenon called a glacial pothole."
Geologist J.C. Branner, 1884
About 20,000 years ago, a powerful, whirling mixture of frigid glacial water, sand and stones wore away solid rock, forming this pothole.
Many Theories
At the pothole's discovery, geologists proposed that it was carved by a waterfall falling through a crevasse (crack) in the glacier. Many modern geologists still support this original theory.
A recent addition to this hypothesis places a lake on top of the glacier as a long-term water supply for the waterfall.
Other geologists propose that there was no waterfall. They argue that a large, fast-moving stream under the glacier supplied the swirling water that created the pothole.
Melted ice carrying abrasive sand and stones created this glacial pothole.
Comparisons confirm that this is a world-class glacial pothole. From bottom to top it measures 38 feet. At one place it is 42 by 24 feet in diameter.
HM NumberHM26KF
Placed ByPennsylvania Department of Conservation & Natural Resources
Marker ConditionNo reports yet
Date Added Tuesday, April 3rd, 2018 at 7:02pm PDT -07:00
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Locationbig map
UTM (WGS84 Datum)18T E 452099 N 4595740
Decimal Degrees41.51186667, -75.57401667
Degrees and Decimal MinutesN 41° 30.712', W 75° 34.441'
Degrees, Minutes and Seconds41° 30' 42.72" N, 75° 34' 26.46" W
Driving DirectionsGoogle Maps
Area Code(s)570
Closest Postal AddressAt or near 801-859 US-6 BUS, Archbald PA 18403, US
Alternative Maps Google Maps, MapQuest, Bing Maps, Yahoo Maps, MSR Maps, OpenCycleMap, MyTopo Maps, OpenStreetMap

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