Syncline

//ˈsɪn.klaɪn// noun

Definitions

Noun
  1. 1
    A concave-upward fold in rock strata

    "Fontaine de Vaucluse, France, is the deepest known karst spring, -315 m. Lower parts were explored by a robot submersible. It is probably the ascending limb of a single loop in a syncline."

Etymology

From syn- + -cline.

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