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Pic of baculites from my collection; pic taken by me on 3/13/05.
They are pyratized to a large extent. Some also show traces of the original nacre (mother-of-pearl) shells. Baculites are a kind of ammonite. These come from the Pierre Seaway strata of South Dakota, USA. They are inside casts, and the suture lines of the internal septa can be seen.
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