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Found 313 results

  1. Trilobite ID request

    Good morning folks. I have just received a Trilobite from the Silurian Period of Kankakee, Illinois. It has not been identified by the seller and I'm wondering if someone here might know what species this is.
  2. Think its a bone

    Hi, thanks in advance. Found near st Louis in illinois. It seems to have hematite or iron coating. I also collect bones and that sure looks like a fossilized bone. Really lightweight.
  3. Pit 11 Poychaete Identification Help

    Hi all, this is one of the polychaete worms from the batch of Pit 11 concretions I'm working on. From what I can see of the conical jaws it most closely resembles Didontogaster corydylina but the jaws blend a bit together and aren't as distinct as some other specimens I've found. The body profile seems a little off (no swollen front section for one) so I wanted to ask for second opinions. Am I getting too hung up on the profile of a body that could just be more outstretched? I appreciate everyone's thoughts.
  4. Pennsylvanian Bivalve (Bond Formation)

    This bivalve came from an outcrop of the Bond Formation in Edgar County Illinois. Edit: After further research it seems to resemble something in the family Sanguinolitidae but without better references that is likely as far as I will get with it. Hopefully someone will have another idea or more experience with this strata and area.
  5. I collected this little worn cephalopod in a stream in Peoria County Illinois. The area is primarily Patoka-Shelburn Formation Undivided (Pennsylvanian) but it wasn't found in-situ. I sectioned a piece for identification and the siphuncle seems large for the Pennsylvanian cephalopods known from the area. To my eyes it looks a lot like Actinoceras (which I guess would mean Ordovician) based on the position and size of the siphuncle. Does anyone have any other ideas?
  6. Devonian of Illinois Identification Help

    This beautiful specimen came from the Clear Creek Formation (Devonian) of Illinois in Union County. Does anybody have any ideas for identification?
  7. Hi everyone, These unidentified specimens were collected in Union County, Illinois. It's from Mississippian strata, likely the Ste. Genevieve Limestone or St. Louis Limestone. I haven't been able to track down a proper map of this quadrangle yet. The smaller specimens resemble mound bryozoa like Prasopora and the cups of all of them display concentric layers like related bryozoans. There aren't any pores visible so I've been thinking about bisecting one of the smaller specimens to see if any radiating zooecia are visible. What does everyone else think? Does anyone have any idea on what they are?
  8. Hello all, I have been a long time lurker of the forum (simply reading has been helpful enough these years) but have finally decided to request identification help on some fossils. I spent the summer conducting research in Illinois and spent my spare time collecting fossils. I was fortunate enough to collect Mazon Creek fossils about 14 years ago on a trip so I was thrilled to finally return to the area and collect at the Mazonia Braidwood Fish and Wildlife Unit. I have Key to Identify Pennsylvanian Fossil Animals of The Mazon Creek Area as well as Jack Wittry's The Mazon Creek Fossil Flora and these have been very helpful in identifying specimens but this one has thrown me a bit. As for the fossil, it resembles an arthropod appendage (like a Eurypterid walking leg) but I might be blinded by my wishing it to be that. I appreciate any help and insight from people more experienced with Mazon Creek. I will likely post more unidentified material from Illinois and Missouri soon. Thanks for your time. -Tom
  9. Carboniferous fish tooth?

    I found this in a phosphatic nodule from the Mecca Quarry Shale (Middle Pennsylvanian) of Illinois. It's pretty jumbled, perhaps as a result of digestion. My first reaction was that this is the base of a fish tooth, but I am not positive. Any thoughts?
  10. Nautiloid

    Hello all, I don't know much about cephalopods and really could use your help. I found this small rock with the tiny nautiloid specimen in the banks of the Rock River in Ogle county, Illinois. The area's bedrock is Middle Ordovician (Mohawkian, Ancell Group). I believe it belongs to the order of the Actinoceridae. The "camerae" end in double pointed arches instead of a straight edge, just as Wikpedia's illustration shows in the 2nd pic below. What seems to be unusual in my specimen - can't find any photos of this anywhere - are the rounded camerae, vs the tightly lined-up straight banding on other specimens. (I'm not sure about the correct terminology...sorry). If I'm not totally off base, is there a chance to narrow down the ID further? Thanks in advance. General form of Actinocerid:
  11. ID HELP PLEASE!

    This was found near the Farmdale Geologic Exposure, and I am having a heck of a time identifying it; I'm used to your typical bryozoa, crinoid, and brachiopod - not this! The inner, u-shaped part looks biological, and is packed with a more clay-sourced material around it, and perhaps inside? I've taken numerous pictures to try to give a full look at this weird find. The outermost rock layer can flake off of picked. I'm not even 100% convinced it's a fossil, but i'm having trouble coming up with what in the world it could be. Please help me out!
  12. Illinois Black Shale

    This is black shale from southern Grundy County, Illinois from a private rec club found in the spoils hills throughout the club. I have found a few listracanthus spines and numerous bivalves from this area. I am unsure as to what these structures are but thinking a type of mollusk or ammonite. Pics 1-3 is one fossil and pics 4 and 5 is another fossil. Thanks
  13. dino poop?

    Found in Pennsylvanian layers; shale, mudstone, lignite, in Illinois; petrified wood nearby. Is this dinosaur poop?
  14. Mazon Creek Pit 11

    Next weekend we will be in Marblehead, Ohio visiting my sisters. I had hoped to stop at St Paul, Indiana on the way to look for some fossils. Unfortunately the quarry does not allow visitors at this point due to Covid. My thought then was to consider Mazon. About a month ago, a post was made similar to this one. It was suggested not to visit due to the ticks and other creepy crawlers. Are the critters still a problem??? Does covid close this park too?? I am all ears to suggestions. Thanks!! If this is not a good choice, there is always the go to Paulding, Ohio!!!! Mike
  15. Is it a tooth?

  16. oddball Pennsylvanian ?alga

    Anyone seen this species or similar? Found in Pennsylvanian spoil piles of central Illinois (near Peoria). Is it part of some kind of alga? Not my find and not my specimen, so these photos are basically what we have to go on. More broadly, can anyone here recommend a Treatise-style taxonomic book detailing known algal heads / macroalgae in the fossil record? Thanks.
  17. Pennsylvanian unknown microfossil

    I found this small specimen while splitting some Pennsylvanian black shale today. As usual, I'm not sure what it is. Looks like a jaw to me but I really don't know. It measures about 5mm long. Any thoughts? @jdp @RCFossils @deutscheben
  18. Pennsylvanian Plant ID Help

    These fossils were found in Westville, IL (Vermillion County) a long time ago by my great grandfather (the grey/black fossil; he worked in the coal mine), and my dad (the light brown/reddish one; on a slag heap). After reading this Publication Title: Guide to Pennsylvanian fossil plants of Illinois Publication Type: Geoscience Education Series Author: James R. Jennings Year: 1990 and looking at a number of photos for comparison, I am wondering if these are Alethopteris sertii? (other guesses are Neuropteris and Acitheca). At least that is my (un)educated guess after desperately trying to make sense of the Jennings paper. Also, on the first photo within the green box I noticed that the foliage has two different looks to it. Were the individual leaves (?) different or is this a result of the way the plant was fossilized? I appreciate all corrections and additional knowledge/comments on these two fossils. This forum identified a nautiloid I have, and I am so appreciative of the feedback and support you give!
  19. Pennsylvanian black shale unknown

    I found this while splitting some Middle Pennsylvanian black shale (Carbondale Fm) today in Illinois. It certainly looks fishy, but I haven't seen anything like it before. Any ideas?
  20. 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!
  21. Isolated Pennsylvanian micro tooth

    I found this teeny tiny tooth when I was smashing some matrix from the Pennsylvanian La Salle Limestone. It’s about 2 mm tall and has a shiny tip and more matte “root”. Since this is a marine deposit my assumption would be that this is a fish tooth, but is it possible to identify it any further? Here it is on the matrix: and here is the tooth itself:
  22. Fossil skin?

    Hi. First time poster here. I found this in my rock beds surrounding our foundation. We did not order these rocks, so I'm not 100% certain where it might have come from. I'm in central Illinois. I'm really just interested in knowing what it is. Thanks for any help!
  23. Mazon Creek plants

    These two Pit 11 nodules popped over the past couple weeks. I haven't found anything similar to either in the past, so I'm hoping for a bit of help. #1)
  24. Hey guys! It’s been a while since I’ve been active, it’s good to be back My roommate and I took a trip out to Oglesby, IL today for his first fossil hunt! We found some nice brachiopods, but the absolute winner for me were two associated shark teeth (I think). It might be a cladodont, but sharks are really out of my spectrum, so if anyone could help I’d be quite appreciative! Oglesby, IL LaSalle Limestone Member Bond Formation Carboniferous, Pennsylvanian Tooth 1 Tooth 1 wet Tooth 2 Tooth 2 wet
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