Shastoceras
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| Shastoceras Fossil range: Lower Aptian of the Cretaceous |
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 Annuloceras and Shastoceras behemothi
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Shastoceras ("Shasta's horn") is an extinct genus of ammonite cephalopod found in Lower Aptian sediments in Northern California.
It, like its close relative, Annuloceras, is a heteromorph ammonite that strongly resembles Macroscaphites.
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