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eugeosyncline

[yoo-jee-oh-sing-klahyn, -sin-] /yuˌdʒi oʊˈsɪŋ klaɪn, -ˈsɪn-/
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.
Origin of eugeosyncline
1940-1945
First recorded in 1940-45; eu- + geosyncline
Related forms
eugeosynclinal, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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