Submitted by: David Thompson
Taxon: Arthroacantha carpenteri
Submit date: 2007-02-13
Location (approximate): Arkona, Lambton, ON
Stratigraphy: Arkona Formation
Age: Erian (Middle Devonian)
Submitter notes: This is the top view of an Arthroacantha carpenteri crinoid calyx showing the anal pyramid with a very pronounced borehole. Again U.S. 10 cent pc. for scale.

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