The geophysical history of the Guthrie Oil Field, as presented in this paper, consists of a reflection seismograph survey in early 1938; a re-interpretation of these data in 1941; and a detailed reflection seismograph survey in 1941, after the discovery of oil, to outline dimensions of the structure more definitely. Early concern over the fact that Viola reflection times failed to show east closure on the structure was later dispelled when drilling developments showed that closure actually was not present on horizons above the Second Wilcox sand.

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