. Bulletin. Natural history. 52 PEABODY MUSEUM BULLETIN 35 paleontology. For precise stratigraphic occurrences of individual specimens see the stratigraphic data of the appropriate locality listed in Appendix B. Unfortunately, only three taxa are represented by large enough samples to provide meaningful stratigraphic ranges. These are Tenontosaurus tilletti (gen and sp. nov.), Sauropelta edwardsi (gen. and sp. nov.) and Deinonychus antirrhopus. Tenontosaurus appears to occur at all levels within Units V, VI and VII but is most common in the upper part of V and the lower part of VII. Sauropelta
. Bulletin. Natural history. 52 PEABODY MUSEUM BULLETIN 35 paleontology. For precise stratigraphic occurrences of individual specimens see the stratigraphic data of the appropriate locality listed in Appendix B. Unfortunately, only three taxa are represented by large enough samples to provide meaningful stratigraphic ranges. These are Tenontosaurus tilletti (gen and sp. nov.), Sauropelta edwardsi (gen. and sp. nov.) and Deinonychus antirrhopus. Tenontosaurus appears to occur at all levels within Units V, VI and VII but is most common in the upper part of V and the lower part of VII. Sauropelta also appears to range through- out most of the same three units, but again the most common occurrences are in the upper few feet of Unit V and the lower part of Unit VII. Deinonychus is limited to the upper 30 feet (9 m) of Unit V, Unit VI and the lower part of Unit VII. It is most common in the latter. All three taxa appear to be distributed through the se- quence without regard to lithology. As might be expected, fossil remains from Unit VI occur as isolated and water-worn elements. The only articulated specimens were found in the finer grained claystones of Units V and VII. The remainder of the Cloverly fauna is known only from the upper part of Unit V or above. This probably does not represent a true lower limit for these elements of the fauna for several reasons. We expended considerably more effort on the upper part of the sequence (upper half of Unit V, Units VI, and VII) for the simple reason that these strata are more abundantly exposed than are the lower strata. Exploration of the lower part of Unit V, however, was relatively unproductive, and it is my im- pression that it is much less fossiliferous than the overlying beds. In view of the low occurrence of both Tenontosaurus and Sauropelta, the two most common taxa, I sus- pect that many, if not all, of the less common elements of the fauna also range close to the base of Unit V. I regret that we were unable to estab
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