There have recently appeared two excellent papers, the one by Professor Charles Schuchert 1 and the other by Philip B. and Robert E. King,2 which discuss Marathon basin problems. The principal new interpretations afforded by these papers are two: (1) the assignment of the date of most intense deformation to the interval between the Pennsylvanian and Permian, instead of within the Pennsylvanian, as stated by the reviewer;1 (2) the inclusion within Udden’s original Gaptank formation of the strata which the reviewer called in the field the Dugout beds, and originally grouped, on very questionable grounds, with the Tesnus...

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