Excerpt from A Pelecypod Fauna From the Gaptank Formation (Pennsylvanian) West Texas
Special thanks are due Roger L. Batten of the American Museum of Natural History who suggested the study, helped with photographic techniques and quantitative studies, read the manu script, and aided With his support, criticism, and advice.
Dr. Herbert Howe, Professor of Geology, Purdue University, lent much help with the photography.
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