Brabb and Churkin summarize evidence for the Late Devonian age of the Nation River Formation and present data indicating that an unconformity exists between the top of the Nation River and the base of the overlying conglomerate and sandstone member of the Tahkandit Limestone of Permian age. The Devonian age of the formation and the overlying unconformity do not complicate the stratigraphy and structure of the area as Laudon, et al (ibid., v. 59, no. 9, p. 1868-1889, 1966) thought it would. Rather the opposite is true; the recent discovery of a widespread unconformity at the base of the Permian in adjoining areas indicates that the geologic history in east-central Alaska is now in harmony with adjoining areas.

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