[Discussion of GeoScience Abstracts 4-1825]. Boucot cites paleontologic evidence leading to the conclusion that throughout Shannon's paper there is unawareness of how paleontologic information and field data relating to contacts between formations are employed to help ascertain the relationships between superposed stratigraphic units, and that Shannon's case for continuous deposition in the Silurian and early Devonian of Oklahoma is not consistent with the evidence. Shannon replies that too much emphasis has been placed on an unconformity-bounded system, series, or stage, and that paleontologic work of the Hunton Group pursued within this framework had resulted in illogical conclusions on which to base the geologic history of the area.

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