Plummer's Ledge Natural Area
Plummer's Ledge Natural Area in Wentworth, New Hampshire is a 3.5-acre (1.4 ha) plot of land protected by the State of New Hampshire to preserve unique geologic features called glacial potholes.
Geologists usually account for the isolated potholes, now high and dry, by the plunging of melt water through vertical cracks or crevasses in the glacial ice. These cracks, called moulins, caused water, boulders, cobbles, and gravel to churn with intense cutting power, drilling into the slope of a granite ledge. The three giant potholes at Plummer's Ledge are not only very large and very deep, to 20 feet (6.1 m) enclosed depth, but they were cut straight down into a ledge on its 45-degree side slope.
The area was deeded to the State of New Hampshire on May 7, 1938 by George F. Plummer and is administered by the Department of Resources and Economic Development under the Division of Forests and Lands.
References
- The Geology of New Hampshire Part I—Surficial Geology. New Hampshire State Planning and Development Commission, Concord, 1958.
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New Hampshire Department of Resources and Economic Development (web)
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