dialout Posted February 21, 2017 Author Share Posted February 21, 2017 5 minutes ago, EMP said: Is this where you've found the ferns? No ferns were near kiskI river about 125 miles south and east of erie Link to comment Share on other sites More sharing options...
EMP Posted February 21, 2017 Share Posted February 21, 2017 Fairview and Girard Ohio or Pennsylvania? Girard Ohio is Carboniferous territory. Girard PA is Devonian. Link to comment Share on other sites More sharing options...
dialout Posted February 21, 2017 Author Share Posted February 21, 2017 Pennsylvania Link to comment Share on other sites More sharing options...
EMP Posted February 22, 2017 Share Posted February 22, 2017 In that case I'd tentatively go with Devonian. Those rocks around there a late Devonian (Fammenian) in age, and are deep water deposits so trilobites would be incredibly rare. Is it possible it was carried there by glaciers? That might extend the age to the Ordovician shales in Ontario and New York, which would make it more likely to be a trilobite ichnofossil. Similar things exist here in the Brallier Formation, but those were shallow water deposits. Link to comment Share on other sites More sharing options...
Archimedes Posted February 22, 2017 Share Posted February 22, 2017 The traces fossils of Cruziana represent more than one type of critter I believe 1 Link to comment Share on other sites More sharing options...
Rockwood Posted February 22, 2017 Share Posted February 22, 2017 5 hours ago, Archimedes said: The traces fossils of Cruziana represent more than one type of critter I believe That is kind of a basic concept in ichno fossils. Don't forget different behavior as it relates to motivation as well. Link to comment Share on other sites More sharing options...
EMP Posted February 22, 2017 Share Posted February 22, 2017 I know (I've seen it in the Mississippian), but the bedrock of that area is late Devonian so it would have to be from a marine arthropod, which at this point is pretty much exclusively trilobite. I still think this could have been brought in by glaciers. Link to comment Share on other sites More sharing options...
Rockwood Posted February 22, 2017 Share Posted February 22, 2017 1 hour ago, EMP said: at this point is pretty much exclusively trilobite. With all due respect. I think this would be a weak argument even if I believed it to be true. Link to comment Share on other sites More sharing options...
Archimedes Posted February 22, 2017 Share Posted February 22, 2017 I mainly collect upper Mississippian, Chesterian strata but do collect Devonian an Pennsylvanian too. In the upper Mississippian Chesterian it is very evident that all the Rusophycus type rest traces and all the Cruziana type trace fossils are not all created by Trilobites. 14 hours ago, Archimedes said: The traces fossils of Cruziana represent more than one type of critter I believe 9 hours ago, Rockwood said: That is kind of a basic concept in ichno fossils. Don't forget different behavior as it relates to motivation as well. 1 Link to comment Share on other sites More sharing options...
piranha Posted February 22, 2017 Share Posted February 22, 2017 6 hours ago, EMP said: ...so it would have to be from a marine arthropod, which at this point is pretty much exclusively trilobite... There are other possibilities besides arthropods. It is certainly not Cruziana. It matches well with something similar to Saerichnites attached for comparison. 5 Link to comment Share on other sites More sharing options...
EMP Posted February 22, 2017 Share Posted February 22, 2017 Piranha's guess is probably it. Link to comment Share on other sites More sharing options...
doushantuo Posted February 23, 2017 Share Posted February 23, 2017 relevant or not? Link to comment Share on other sites More sharing options...
doushantuo Posted February 23, 2017 Share Posted February 23, 2017 Isn't Saerichnites more of a fossil for bathyal flysch deposits(e.g.hypichnial semi-relief ones on turbidite soles(vide e.g. Acenolaza/Uchman/El Kadiri/Demircan)? Link to comment Share on other sites More sharing options...
EMP Posted February 23, 2017 Share Posted February 23, 2017 That would be the environment of these rocks, at least the stratigraphically equivalent ones in Maryland Link to comment Share on other sites More sharing options...
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