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The syncline, downfolding of the strata in the form of a trough, as at a; an anticline is an upfolding of the strata in the form of an arch, as at b, vintage line drawing or engraving illustration.
An overthrust anticline of a strata fold, a reverse fault, the rocks on the upper surface of a fault plane moved over the rocks on the lower surface, vintage line drawing or engraving illustration.