File:Hexagonaria percarinata fossil coral (Petoskey Stone) (Traverse Group, Middle Devonian; Michigan, USA) 2 (15201883941).jpg

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Hexagonaria percarinata Stumm, 1969 - fossil rugose coral from the Devonian of Michigan, USA. (polished surface; field of view ~1.5 cm across)

The “official state stone” of Michigan is the Petoskey Stone, the local name for rounded pebbles or cobbles of the fossil colonial rugose coral Hexagonaria percarinata. 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 consist of many lithologies, including fossiliferous limestone clasts and worn fossil corals (favositids & colonial rugosans).

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.

Classification: Animalia, Cnidaria, Anthozoa, Rugosa, Phillipsastraeidae

Stratigraphy: Traverse Group, Middle Devonian

Locality: unrecorded/undisclosed site in Michigan, USA

See info. at:

<a href="https://en.wikipedia.org/wiki/Rugosa" rel="nofollow">en.wikipedia.org/wiki/Rugosa</a>
Date
Source Hexagonaria percarinata fossil coral (Petoskey Stone) (Traverse Group, Middle Devonian; Michigan, USA) 2
Author James St. John

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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/15201883941 (archive). It was reviewed on 5 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0.

5 December 2019

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current03:27, 5 December 2019Thumbnail for version as of 03:27, 5 December 2019939 × 888 (877 KB)Ser Amantio di Nicolao (talk | contribs)Transferred from Flickr via #flickr2commons

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