One of the mysteries of the English language finally explained.
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).
1940s; earliest use found in Bulletin of the Geological Society of America. From mio- + geosyncline, after miogeosynclinal.
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