The Thurman-Wilson fault has already received some attention in the geologic literature of Iowa.2 Todd recognized it close to Missouri River in 1889; Smith computed its throw (300 feet) at that point in 1909, and expressed the opinion that it changed into an anticline farther, to the northeast, near Red Oak and Stennett; Keyes, in 1916, mentions its presence near Red Oak without contributing any data with reference to it; Tilton came across it in 1915, north of Briscoe, north of Bridgewater, and farther to the northeast, in work in Cass and Adair counties, first published in 1919; described it as a normal fault downthrow on south side of 284 feet, and this last summer, 1921, located the fault definitely at three additional points:3 close to the river northwest of Red Oak, at the southwest corner of section 18, Harrison Township, Adair County, and close to the Dallas County . . .

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