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n.1.(Paleon.) A genus of extinct Merostomata, found in Silurian rocks. Some of the species are more than three feet long.
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5 + m--microlaminated, silty, argillaceous eurypterid-dolostone with Eurypterus remains, nautiloids, and ostracods (Herrmannina).
Beds with Eurypterus (now the Rootsikula Stage) were first distinguished as a separate stratigraphical unit by Schmidt (1891) and were correlated with the lower part of the Ludlow.