RT @FossilBonanza: The Oldest sea scorpion is Pentecopterus from the Ordovician Winneshiek Shale in Iowa. Despite this acclaimed status, th…
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RT @FossilBonanza: Pentecopterus decorahensis is so far the oldest known Eurypterid. This beaut was found in the Ordovician-age Winneshiek…
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RT @FossilBonanza: Pentecopterus decorahensis is so far the oldest known Eurypterid. This beaut was found in the Ordovician-age Winneshiek…
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RT @FossilBonanza: Pentecopterus decorahensis is so far the oldest known Eurypterid. This beaut was found in the Ordovician-age Winneshiek…