Horn Corals with inarticulate attachments

Submitted by: David Thompson
Taxon: Heliophyllum halli, Petrocrania hamiltoniae, Cystiphyllum
Submit date: 2007-03-09
Location (approximate): Thedford, Lambton, ON
Stratigraphy: Widder Formation
Age: Erian (Middle Devonian)
Submitter notes: Two different species of horn corals from Arkona & Thedford, Ontario that have the distinct 'scar' of attachment, the bottom valve of the inarticulate braciopod, Petrocrania hamiltoniae, clearly showing. The coral on the left is probablly Cystiphyllum sp.? while the one on the right is Heliophyllum halli. A U.S. Ten Cent piece is for scale. The top valve of the Inarticulate is missing showing the interior muscle scars.

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