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Possible Pre-Springeran Unconformity in Southern Oklahoma: Abstract
Since the relationships among post-Devonian, pre-Morrowan units (Woodford, Sycamore, Caney, Goddard and Springer) in southern Oklahoma are apparently of a conformable nature, previous reports on this complex area have attributed any interruption of the normal succession of these strata to faulting. In the Madill-Aylesworth area of Marshall and Bryan Counties, Oklahoma, the writers find a systematic pattern at the base of the Goddard Shale such as would be formed by deep erosion of a pre-Springerian anticline. Thick sections of Goddard are found in off-structure positions and in a belt presumed to occupy a deep valley along the axis of the old anticline. Detailed cross sections and reconstructions to an early Pennsylvanian datum indicate an axial valley over 2500 feet deep (cut largely in Simpson and Arbuckle) between strike ridges formed by the limbs of the anticline. Confirmation of this interpretation is seen in the localization of sand accumulation over presumed topographic highs on the buried erosion surface. Possible relationship between the postulated ero-sional episode and the boulder beds of the Johns Valley Shale (Ouachita province) is suggested.
Acknowledgments and Associated Footnotes
1 Evanston Exploration Corporation, Evanston, Illinois
2 Northwestern University, Evanston, Illinois
Manuscript reeiceived August 5,1965. Modified from a paper presented before the Mid-Continent Regional Meeting, American Association of Petroleum Geologists, Oklahoma City, November 1963; and before the Tulsa Geological Society, February 8, 1965.
Copyright © 2006 by the Tulsa Geological Society