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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.
References in periodicals archive ?
Shaver, Editors, Modern and Ancient Geosynclinal Sedimentation, a Symposium, Special Publication Soc.
The graphite is generally believed to have been derived from the protolith of the host rock, a black shale rich in carbonaceous sedimentary organic matter that was deposited in a geosynclinal environment around 1.
1958, Zonality in the structure of terrigene deposits in platform and geosynclinal regions.
The island is composed of geosynclinal deposition of Tertiary sediments of the most recent era (the Cenozoic) to a thickness of more than 10,000 meters on a metamorphic base formation (Figure 1).