miogeosyncline
/ˌmʌɪə(ʊ)ˌdʒiːə(ʊ)ˈsɪŋklʌɪn/Geology
noun
A geosyncline containing little or no volcanic rock; especially one situated between a larger, volcanic geosyncline (a eugeosyncline) and an area of the crust that has achieved stability (a craton).
Origin
1940s; earliest use found in Bulletin of the Geological Society of America. From mio- + geosyncline, after miogeosynclinal.