You searched for: “geosyncline
geosyncline (s) (noun), geosynclines (pl)
An extensive, basin-shaped, mobile downward subsidence of the Earth's crust: A geosyncline is caused by the deposition of a considerable thicknesses of sedimentary and volcanic rocks over millions of years.
This entry is located in the following units: geo-, ge- + (page 19) syn-, sy-, sym-, syl-, sys- (page 5)