Add to ORKGRepeated reference of late to the presence of geosynclines in Iowa directs attention to the fact that there appear to be really no such features displayed within the limits of our state. Erroneous use of the term is perhaps largely due to the original misleading composition of the word. It seems not to be realized, even in our text-books, that the feature to which Hall originally referred is an unusually thick body of sedimental accumulation, rather than a structure as many appear to think, or that Dana, who coins the sonorous title, converts the Hall concept into a structural affair rather than a sedimental one, and t~reby confuses all who come after