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  • noun Plural form of downfold.


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  • Large portions, especially of the upfolds, or "anticlines," of the waves, have been subsequently removed by erosion; the edges of these upfolds have been exposed, thus weathering out their fossilized contents, while downfolds are still buried beneath the earth for the explorers of coming centuries.

    Dinosaurs With Special Reference to the American Museum Collections William Diller Matthew 1900


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