devil's corkscrew

English

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Noun

devil's corkscrew (plural devil's corkscrews)

1. A meters-deep, corkscrew-shaped formation of compact earth found in the American Midwest that is the infilled burrow of an ancient beaver genus †Palaeocastor

References

• “devil's corkscrew”, in OneLook Dictionary Search.
• devil's corkscrew on Wikipedia.Wikipedia