A fold or crease that bends or turns downward, or in geology, a syncline or downward-bending rock formation.
Compound of 'down' and 'fold,' used in geological terminology since the 19th century. Describes the spatial configuration of layered rocks bent downward by tectonic forces.
Geologists look at rocks folded downward into 'downfolds' and upward into 'upfolds,' and these patterns tell the story of massive continental collisions. A downfold can trap valuable oil and water deposits, making it economically important and scientifically fascinating.
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