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Geologists digging into Mima mounds mystery say gophers behind it

A new twist on an old mystery may finally settle the debate over the origin of Mima mounds, which bulge out of the ground like enormous, grass-covered bubble wrap.

Mima mounds (sounds like dime-a) were named in 1841, when a vast pimply prairie (the Mima Prairie) was discovered in western Washington during the United States Exploring Expedition. In the centuries since, the source of this strange landscape has defied explanation. A single field may be covered in a million mounds that are several thousand years old, yet no builder has ever been found.

Early explorers thought Mima mounds were Native American burial sites, but no skeletons or grave relics were inside. Armchair experts have suggested many other hypotheses, from earthquakes to floods to extraterrestrials.

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