Shanmugam and Moiola (1994a, b, 1995) have generated substantial controversy and reexamination of what was originally thought to be a well-understood stratigraphic interval of deep-water origin in the Carboniferous Jackfork Group of Arkansas and Oklahoma. This reexamination of interpretation is good in that it forces sedimentologists, sequence stratigraphers, and reservoir geologists to reconsider their understanding of deep-water processes and products, usage of scientific terms to communicate interpretations, and the economic consequences of being nearly right or certainly wrong.

Examination of Shanmugam and Moiola (1995) prompts brief comments on three issues: (1) the classification of a sedimentary deposit based on...

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