Ron E. Posted July 12, 2009 Share Posted July 12, 2009 Found this mystery nodule in some very hard limestone, in amongst dozens of layers of brachiopods and bryozoans, and a few horn corals. Early Mississippian, Boone Limestone Formation, Benton County, Ark. Any ideas? Link to comment Share on other sites More sharing options...
Auspex Posted July 12, 2009 Share Posted July 12, 2009 Looks kinda' crinoidy. "There has been an alarming increase in the number of things I know nothing about." - Ashleigh Ellwood Brilliant “Try to learn something about everything and everything about something.” - Thomas Henry Huxley >Paleontology is an evolving science. >May your wonders never cease! Link to comment Share on other sites More sharing options...
Ron E. Posted July 12, 2009 Author Share Posted July 12, 2009 Looks kinda' crinoidy. The striations completely encircle it, but are far from straight. It reminds me of a wind-weathered rock in the desert. A geologist here in Arkansas wasn't 100% sure it was organic (from viewing my pics, not hands-on), but the fact that it was on the bottom of the sea surrounded by millions of brachs and bryos leads me to believe it was alive once. Link to comment Share on other sites More sharing options...
Terry Dactyll Posted July 12, 2009 Share Posted July 12, 2009 Ron E...... Looks 'Fossily' to me to Ron...... something that may have been distorted, but definately a fossil of somekind, like a clam.... Cheers Steve... And Welcome if your a New Member... Link to comment Share on other sites More sharing options...
Shamalama Posted July 12, 2009 Share Posted July 12, 2009 Maybe a crushed or warped Horn Coral? Did you see any other instances of Horn corals in the bed that had similar striations? -Dave __________________________________________________ Geologists on the whole are inconsistent drivers. When a roadcut presents itself, they tend to lurch and weave. To them, the roadcut is a portal, a fragment of a regional story, a proscenium arch that leads their imaginations into the earth and through the surrounding terrain. - John McPheeIf I'm going to drive safely, I can't do geology. - John McPheeCheck out my Blog for more fossils I've found: http://viewsofthemahantango.blogspot.com/ Link to comment Share on other sites More sharing options...
Frank Menser Posted July 12, 2009 Share Posted July 12, 2009 Have you checked it for hardness? Try seeing if glass can be scratched by it (or vise versa). looks more like the outside of a nodule poss an agate nodule to me. Be true to the reality you create. Link to comment Share on other sites More sharing options...
Ron E. Posted July 12, 2009 Author Share Posted July 12, 2009 Have you checked it for hardness? Try seeing if glass can be scratched by it (or vise versa). looks more like the outside of a nodule poss an agate nodule to me. No agates in my area that I'm aware of, Frank M. I've seen similar striations in horned corals and even some brachs, but the lower(?) end is complete, and there's no opening. Could possibly be a former opening crushed, I s'pose. There is a bit missing from the top (?) which might have led to a horn's cone tip. Link to comment Share on other sites More sharing options...
mommabetts Posted July 13, 2009 Share Posted July 13, 2009 ? Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted July 13, 2009 Share Posted July 13, 2009 It looks like the stromotoporoid Aulaceras, but I don't know their range. Can you put some magnification to it? Link to comment Share on other sites More sharing options...
Ron E. Posted July 13, 2009 Author Share Posted July 13, 2009 It looks like the stromotoporoid Aulaceras, but I don't know their range. Can you put some magnification to it? I'll shoot some magnified pics and post on Wednesday. Link to comment Share on other sites More sharing options...
Guest solius symbiosus Posted July 14, 2009 Share Posted July 14, 2009 I did some searching, and found that the aulaceratids are Mid., and Upper Ord., so it can't be that. If it were a rugosid, there should be some remnants of the septa, and/or tabulae still present. Link to comment Share on other sites More sharing options...
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