eugeosyncline

(from the article `geosyncline`) ...volcanic sequences, together with graywackes (sandstones rich in rock fragments with a muddy matrix), cherts, and various sediments reflecting ...
Found on http://www.britannica.com/eb/a-z/e/50

Eugeosyncline

A geosyncline situated seaward from a continent and characterized by sediments deposited by turbidity currents and derived in part from a volcanic arc.
Found on http://www.evcforum.net/WebPages/Glossary_Geology.html

Eugeosyncline

The seaward part of a geosyncline
Found on http://www.encyclo.co.uk/local/22392

eugeosyncline

The seaward part of a geosyncline; characterized by clastic sediments and volcanism.
Found on http://www.scientificpsychic.com/etc/geology-glossary.html
No exact match found