Fox Hills, South Dakota
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A spectacular population of molluscs occurs in the Upper Cretaceous rocks in the Fox Hills of South Dakota. The fauna is preserved in calcium carbonate cemented concretions that solidified in a post-depositional setting before compaction could affect the shape of the shells. Due to this unique mode of preservation, specimens are often preserved with the colorful iridescence of the nacreous layer of the shell. A scaphite, Hoploscaphites nodosus (Morton), from the Fox Hills, appears as the logo on the Peabody's periodical Postilla and on the Bulletin of the Peabody Museum.
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Actinosepia sp., YPM 36425 |
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Eutrephoceras dekayi Morton, YPM 30394 |
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Discoscaphites nebrascensis (Owen), YPM 23166 |
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Hoploscaphites nicolletii (Morton), macroconch, YPM 6398 |
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Hoploscaphites nicolletii (Morton), macroconch, YPM 43299 |
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Hoploscaphites nicolletii (Morton), macroconch, YPM 43302 |
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Hoploscaphites nodosus (Owen), macroconch, YPM 6078 |
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Jeletzkytes nebrascensis (Owen), macroconch, YPM 23144 |
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Jeletzkytes spedeni Landman & Waage, macroconch, YPM 23129 |
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Sphenodiscus lenticularis (Owen), YPM 35096 |
Peabody Museum of Natural History
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