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Lake Lawrence ice-rafted erratic

View on map:46.865057°N 122.578802°W

Comments

"According to Archimedes Principle, the size of the iceberg carrying ice-rafted erratics must have been at least 25 times greater than the erratics themselves." (see reference)

Description


Glacial erratic

A glacial erratic is glacially-deposited rock differing from the size and type of rock native to the area in which it rests. "Erratics" take their name from the Latin word errare (to wander), and are carried by glacial ice, often over distances of hundreds of kilometres. Erratics can range in size from pebbles to large boulders such as Big Rock (16,500 tonnes or 18,200 short tons) in Alberta.

References

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