eugeosyncline

eugeosyncline [yoo-jee-oh-sing-klahyn, -sin-] Word Origin 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 First recorded in 1940–45; eu- + geosyncline Related formseu·ge·o·syn·cli·nal, adjective