Glacial Boulder

Large Glacial Erratic in Canyon Area

Glacial Boulder is a glacial erratic in Yellowstone National Park, WY.

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This precambrian gneiss boulder - the size of several stacked cars and weighing over 500 tons - was carried at least 15 miles and deposited in this location by a massive glacier that once covered the Yellowstone area in thousands of feet of ice.

Nearly all of Yellowstone was covered by an ice cap 4,000 feet thick. Mount Washburn and Mount Sheridan were both completely covered by ice. This ice cap was not part of the continental ice sheet extending south from Canada. The ice cap occurred here, in part, because Yellowstone’s higher elevation volcanic plateau allowed snow to accumulate.

National Park Service
Glacial Boulder
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