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A usually elongate, basinlike depression along the edge of a continent, in which a thick sequence of sediments and volcanic deposits has accumulated.
ge′o·syn·cli′nal (-sĭn-klĭ′nəl) adj.
(Geological Science) a broad elongated depression in the earth's crust containing great thicknesses of sediment
ge•o•syn•cline(ˌdʒi oʊˈsɪn klaɪn)
a portion of the earth's crust subjected to downward warping during a large span of geologic time.