Abstract
Jacob Boll discovered the rich terrestrial fauna of the Texas Permian redbeds. Robert T. Hill mapped and named the Cretaceous formations of north Texas. Both, but especially Boll, supplied fossils to E.D. Cope. Of the more than 30 taxa named by Cope for fossils collected by Boll, Eryops megacephalus stands out as the species illustrated in the logo of the Society of Vertebrate Paleontology.
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