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The sequence stratigraphy of the lower Oligocene in the eastern Gulf Coastal Plain of Alabama and Mississippi has been the focus of research since the early 1980s. The Red Bluff Clay and its correlatives have long been recognized as the lowermost Oligocene lithostratigraphic units in the region. The contact of the Red Bluff Clay with the underlying Shubuta Clay Member of the Yazoo Clay is considered by most workers to be the Eocene–Oligocene boundary. Interpretations of the Vailian sequence stratigraphy of this interval vary, with the Yazoo–Red Bluff contact being viewed as a maximum flooding surface by some workers...

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