Crinoid Calyx

Submitted by: Stan Hyne
Taxon: Megistocrinus concavus
Submit date: 2008-03-12
Location (approximate): Alpena, Alpena, MI
Stratigraphy: Thunder Bay Formation
Age: Erian (Middle Devonian)
Submitter notes: A bottom view of the calyx which measures 34mm in diameter and 25mm high.

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