South Dakota's Ancient Inland Sea Fossils Still Gleam at Smithsonian
Millions of years ago, a vast inland sea covered what is now South Dakota, supporting a rich variety of marine life including ammonites and marine reptiles. Fossils from this prehistoric seaway are currently on display at the Smithsonian's National Museum of Natural History in Washington. Many of these ancient shells retain a natural iridescent sheen due to their mother-of-pearl composition. Ongoing fossil discoveries from this region continue to deepen scientific understanding of prehistoric marine ecosystems. The findings offer valuable clues about Earth's geological and biological history.
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