File:Hexagonaria percarinata (fossil rugose coral) (Traverse Group, Middle Devonian; Michigan, USA) 5 (35614856172).jpg
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[edit]DescriptionHexagonaria percarinata (fossil rugose coral) (Traverse Group, Middle Devonian; Michigan, USA) 5 (35614856172).jpg |
Hexagonaria percarinata Stumm, 1969 - fossil rugose coral from the Devonian of Michigan, USA. (public display, National Rockhound Hall of Fame, Murdo, South Dakota, USA) 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. The specimen shown here is in its natural, rough state, which is unusual - most Petoskey Stones have been polished. 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 rugose coral) (Traverse Group, Middle Devonian; Michigan, USA) 5 |
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@N05/35614856172 (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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current | 03:30, 5 December 2019 | ![]() | 3,008 × 2,000 (4.26 MB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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