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a geosyncline characterized by lithology typical of deep ocean environments
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
eu•ge•o•syn•cline(yuˌdʒi oʊˈsɪŋ klaɪn, -ˈsɪn-)
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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