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The AAPG/Datapages Combined Publications Database
AAPG Bulletin
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Detailed mapping of the Vamoosa, Ada, and adjacent formations in the Seminole area, Oklahoma, has yielded new data for the correlation of sediments of Virgil age. The Ada formation truncates and therefore is younger than the Seminole, Coffeyville, Nellie Bly, Belle City, Hilltop, Vamoosa, and Pawhuska formations.
Unconformities occur at the base of the Vamoosa, within the Vamoosa, at the base of the Ada, and at the top of the Ada. The map pattern made by these unconformities suggests a shoreline, in Virgil time, which trended in general east and west. The Arbuckle Mountains were active during the first half of that epoch; the Ouachita mountain orogeny had not yet taken place.
Trigonometric examination of such unconformities permits a relative, quantitative, evaluation of these uplifts, and indicates a probable trend for the Virgil shoreline.
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