syncline

noun

noun

US /ˈsɪn.klaɪn/

Etymology From syn- + -cline.

Geography, Geology, Natural sciences 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.1988, Noel P. James, Philip W. Choquette, editors, Paleokarst, Springer Science & Business Media, →ISBN, page 36:

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