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I did a long weekend of fossil hunting in Oklahoma and NW Arkansas. All of the formations, fossils and areas were completely new to me. I will have to post a trip report in the next few days. I found this specimen yesterday in a creek in NW Arkansas in the St. Joe Limestone Member of the Boone Formation, which is Carboniferous, Mississippian. I am totally new to the Mississippian. It was all marine stuff. I’d like to ID it before I start removing more matrix so I know what it looks like and don’t accidentally take off something I shouldn’t. I saw lots of brachiopods, but none came even close to the size of this one or was of this species. Most were under 1 inch. This is what it looked like when it was found. I think it is a steinkern. I just thought it was a maybe an inch wide or so from what I could see. It was in a fairly large rock conglomerate. So I attempted to split the rock so the thing could be popped out. Turns out it is 10 x 5 cm or 4 x 2 inches. It is still in the matrix after the first split. This is the negative (cavity) of where it split out of. As you can see part of it remained on the other half. It looks like there may be a little crinoid pice on it too. These are other shots of it. You can see the end where it broke off. I’m curious about the hinge part and what it is supposed to look like. Close up of the hinge parts. The one end appears to be fused with the matrix. The other end looks like it is basically free. Any help on the ID would be greatly appreciated. I wonder if @Ludwigia, @Herb or @fifbrindacier or anyone else might be able to help with the ID.
RTR227 posted a topic in Fossil IDThis is my first post in Fossil Forum...names PD, in the next couple of days I will do an introductory post in the "Introduction" section but I wanted to get started with one of my specimens that has brought me to a wall. Late Devonian - Early Carboniferous, loose find in a fossil contaminated area so identifying the exact formation it came from has been a bit difficult. Possibilities within a stones throw of find are Boone Formation, Penters Chert, Clifty Limestone, Chattanooga Shale and Pitkin Limestone. I have been calling this little guy Tholuslensia collisspongia ONLY until I can identify the actual genus and species. From my current research, I have an initial taxonomy as follows: Porifera | Demospongiae | Chaetetid | Poecilosclerida | AND THAT IS WHERE MY GIANT WALL BEGINS... As you might already be aware, Arkansas does not have a good public fossil record database (something that I am currently working on changing) and trying to identify this sponge down through family, genus and species has been like trying to find the pin cushion that the needle in the haystack came out of. The University of Arkansas focuses more on fossil fuels than actual fossils, they were quite friendly but unable to provide me with any assistance. Their Museum Collection is off limits to me because I am not a paleontologist, accredited institution or research facility. Even though I am not a paleontologist, I do believe myself capable of figuring this puzzle out. It is just one of many paleontology puzzles I am currently working on. I am not afraid of rabbit holes, big words or old paleontology text books so if you have any information or leads that can help me get past this "wall" then by all means, SHARE ;-). There is a possibility that it could have come out of the Ordovician period. The majority of exposure, sediment and specimens from this location are Devonian/Mississippian. There is one new exposure of Ordovician that has surfaced due to creek erosion. It rests below all other primary material and my collisspongia could have eroded out of that exposure based on sheer proximity to the specimens resting location. I have my doubts though because of the iron staining that has permeated the calcified sandstone.Based on the amount of orange tinting the outer surface displays, I would think that the specimen had to have eroded out and been sitting for some time now. New fractures from the Ordovician peek-a-boo seem to be lighter in color ranging from white to camel tan. This orange tint makes me believe that the Ordovician formation is not the host rock that produced my fossil. That being said, I am perfectly comfortable with the idea and most likely, the actuality of being completely and totally WRONG about everything. So long as I can get close to the truth, I am good with as many missteps as it will take. Thanks again for anything you have to offer and thank you for helping create this great resource and forum. Specifications: Length (Middle Lens Curve): 110 mm Width (Across Lens Curve): 100 mm Height (Stem to Top of Dome): 70mm Circumference (Lens Perimeter): 340 mm Substance: White chert, calcified sandstone, limestone present within folds and around bottom stem/base