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Showing results for tags 'shelburn formation'.
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Hello, I have a big batch of concretions from the Pennsylvanian Shelburn Formation of Sullivan County, Indiana, USA. They aren't mazon creek but a lot of the fauna seemed similar, and I wanted to ask for identification on them. Some have been ID'd generically and most of them are said to be probable partial shrimp. There are over 100 so I will split them up into a few posts. 1. Jellyfish 2. Shrimp 3. Horshoe crab pygidium 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22. 23. 24. 25. 26. 27. 28. 29. 30. 31. 32. 33. 34. 35.
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- indiana
- pennsylvanian
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This concretion came from a Pennsylvanian Shelburn Formation site in Vermilion County, Illinois. The fossils are found scattered throughout concretions in a shale layer and indicate a near-shore marine origin, with the most common fossils being tiny to small bivalves, gastropods, goniatites and inarticulate brachiopods, along with occasional plant material. This one has me puzzled though. The concretions don’t split neatly like those from Mazon Creek, so unless the specimens were already exposed by weathering in the field I just smash them and hope it exposes a fossil. This is the only one that looks like this, showing a jumble of negative impressions of organic shapes, some of which are reminiscent of ribs and vertebrae. I can’t make out anything definite, though, so it may just be a suggestively preserved plant or crinoid, or who knows. The section with impressions is about 20 mm wide. Thanks!
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- 5
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- carboniferous
- illinois
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Over the winter I was freezing and thawing nodules found in reclaimed coal mine spoils from the Pennsylvanian Shelburn Formation, Busseron Sandstone from Vigo County Indiana. These contain flora and rare fauna similar to the Braidwood Biota from Mazon Creek. This nodule split off a tiny bit on one end and I set aside for further investigation after a quick glance revealed an interesting pattern. Then I forgot about until I was recently unpacking from a move, and re-examined it under magnification. Unfortunately, the piece that split off the end was lost, so I only have the one side, but it shows a small rectangular patch of texture, about 10 mm wide. The piece preserved shows folds and wrinkles, as well as what looks like a tear in the center, and looking under magnification reveals the entire piece is covered with tiny pebbly bumps. My first assumption would be plant material, but it doesn't match the texture of any of the other plants I have found at this site. A much less likely option would be a patch of skin from some sort of animal or egg casing. I would like to get it under greater magnification and will try to find an expert to look at it, but I wanted to put the best pictures I was able to take here for y'all's thoughts. Thanks!
- 20 replies
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- amphibian
- carboniferous
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