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eugeosyncline

[yoo-jee-oh-sing-klahyn, -sin-]
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noun Geology.
  1. a former marine zone, bordering an ocean basin, marked by very thick deposits of sediment in which the products of volcanic activity are associated with clastic sediments.
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Origin of eugeosyncline

First recorded in 1940–45; eu- + geosyncline
Related formseu·ge·o·syn·cli·nal, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018