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File:Hexagonaria percarinata fossil coral (Petoskey Stone), Michigan.jpg

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Hexagonaria percarinata fossil coral (polished) (field of view ~3.6 cm across) - a “Petoskey Stone” from the Middle Devonian of Michigan, USA.

The “official state stone” of Michigan is the Petoskey Stone, the local name for rounded pebbles or cobbles of the fossil coral Hexagonaria percarinata Stumm, 1969. Petoskey Stones have been weathered & eroded from fossiliferous limestones of the Traverse Group (Middle Devonian). They are particularly common in the vicinity of Little Traverse Bay & the town of Petoskey (northwestern Lower Peninsula of Michigan).

Beach & lake gravel in this area consists of many lithologies, including fossiliferous limestone clasts and worn fossil corals (favositids & colonial rugosans). Hexagonaria is a colonial rugose coral (Animalia, Cnidaria, Anthozoa, Rugosa, Phillipsastraeidae).

The city of Petoskey, Michigan gets its name from an old Ottawa Indian Chief, Ignatius Petosega. “Pet-o-sega” means “rays of the rising sun”. Petoskey Stones are so-named in reference to the dark-colored “eye” & radiating lines of individual Hexagonaria corallites.
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Source Hexagonaria percarinata fossil coral (Petoskey Stone) (Traverse Group, Middle Devonian; Petoskey area, northwestern Lower Peninsula of Michigan, USA) 3
Author James St. John

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This image was originally posted to Flickr by jsj1771 at https://www.flickr.com/photos/47445767@N05/15018260490. It was reviewed on 15 September 2014 by FlickreviewR and was confirmed to be licensed under the terms of the cc-by-2.0.

15 September 2014

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current15:05, 12 September 2014Thumbnail for version as of 15:05, 12 September 20141,028 × 868 (1.12 MB)Tillman (talk | contribs)Transferred from Flickr via Flickr2commons

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