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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.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
References in periodicals archive ?
Overthrust belt in geosynclinal area of western Wyoming in light of fluid-pressure hypothesis," Bulletin of the Geological Society of America, vol.
Shaver, Editors, Modern and Ancient Geosynclinal Sedimentation, a Symposium, Special Publication Soc.
Shaver (eds.), Modern and Ancient Geosynclinal Sedimentation: Society of Econ.
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 1.8 to 2 billion years ago.
and Shutov, V.D.: 1958, Zonality in the structure of terrigene deposits in platform and geosynclinal regions.