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Found 13 results

  1. Joseph Fossil

    Trip to Oglesby 2/18/2023

    Two days ago I went with @Tales From the Shale and another friend on a fossil hunting trip to a Bond Formation Roadcut in Oglesby, Illinois with rocks dating around 307-303 Million years ago, to the Pennsylvanian section of the Carboniferous era. Hadn't been back to the site since October 2022 and it was good to be back! I was pleasantly surprised at the lack of snow. But it was clear it only melted very recently judging by the arm sized icicles and the mud. (Quick advice for anyone planning to go fossil hunting at this time in Oglesby: bring snow bo
  2. I recall not too long ago there was a pretty interesting scientific article published in the Journal Science describing how scientists analyzed the amount and diversity of chondrichthyan denticles in ichthyoliths from the North and South Pacific dating from around 20-19 million years ago and discovered a sharp drop in the number and diversity of denticles around 19 million years ago, indicating a massive extinction took place which took sharks 2 to 5 million years to somewhat recover from (it's still unknown if this impacted chondrichthyans worldwide or just in the pacific). Here's the paper:
  3. Starting in 2021, I've been going fossil hunting around the Mazon Creek area in Grundy County, Illinois. The site I visit the most so far is the fairly large Mazonia-Braidwood State Fish and Wildlife Area and at first, I would barley find anything. Then after visiting Monster Lake and another secret location in the area, I started finding more fossils. However, most are around 2-7 cm. In length and I'm still having difficulty getting IDs for them? Would anyone be able to help ID them? I think this could be some sort of Chondrichthyan or a lobe finned fish?
  4. I've been fascinated with the Eugeneodontids (the buzz-saw chondrichthyans) and how they managed to practically become the apex predators of most oceanic environments from the Carboniferous to the Permian with famous members like Edestus and Helicoprion. Two genus of this extraordinary group even survived the Permian-Triassic Extinction 252 Million Years ago - Fadenia and Caseodus! http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=34456 http://www.fossilworks.org/cgi-bin/bridge.pl?a=taxonInfo&taxon_no=34451 But by the Olenekian stage
  5. Hi! Me and @Tales From the Shale are actively thinking of going on a fossil hunting trip in Alton Illinois (right by St. Louis, Missouri) this week to analyze the Mississippian period St. Louis limestone and I'm wondering if anyone else has gone down there? https://www.mindat.org/feature-4232679.html We're specifically looking for fossils of the Meramac group and though we have a quarry or two, we're thinking of also checking out any road cuts in the area. I'm wondering before we go on the fossil hunt (likely this Saturday), could anyone offer some info on any good road
  6. On Saturday I went fossil hunting with @Tales From the Shale in Utica, LaSalle County, Illinois! We drove for some time looking for roadcuts when we discovered an abandoned clay pit not too far away from the town itself. I learned later its rocks date to the Pennsylvanian period of the Carboniferous era. There were also a bunch of nodules there too, but mostly it was stark shale and Excello shale. We opened the shale rocks up and we found a massive amount of small fossil imprints. But we also found some likely Chondrichthyan spines which I was wondering if anyone could ID the genera?
  7. Joseph Fossil

    Trip to Oglesby 10/08/2022

    A few days ago, I went with @Tales From the Shale and another friend on a fossil hunting trip to a Bond Formation Roadcut in Oglesby, Illinois with rocks dating around 307-303 Million years ago, to the Pennsylvanian section of the Carboniferous era. We worked for at least 5 to 6 hours, but it was worth it! This was one of the best fossil hauls I've had in a long time at that location! The true gem of that trip was this Cladodont tooth I discovered by sheer accident!!! The specimen may come from the Shark Gilkmanius, but I'm not too sure?
  8. Joseph Fossil

    Bond Formation Cladodont species ID

    Recently I went on a fossil hunting trip with a few friends to a roadcut in Oglesby Illinois from the Pennsylvanian Bond Formation. This was around July and I found a lot of cool Brachiopod fossils, but I decided a few days ago I wanted to get a closer look at some of the larger matrixes I collected to see if I missed something! At the very edge of one the matrixes, I discovered a small pretty exposed cladodont tooth that I couldn't find a specific ID of? The specimen is about 1/2 inch in length (5.0 mm.). But I wanted to see it a bit closer, so I put it under a microscope on
  9. Fish got their jaws millions of years earlier than previously thought Meet the spiny, ancient Fanjingshania renovatais—likely the oldest discovered fish ancestor with jaws. Laura Baias, Live Science Ancient 'shark' from China is humans’ oldest jawed ancestor Palaeontologists discover a 439-million-year-old 'shark' that forces us to rethink the timeline of vertebrate evolution Chinese Academy of Sciences, Eureka Alert, October 3, 2022 The paper is: Andreev, P.S., Sansom, I.J., Li, Q., Zhao, W., Wang, J., Wang, C.C., Peng, L.,
  10. minnbuckeye

    Chondrichthyan Teeth Unknowns

    I am in the process of identifying the Chondrichthyan teeth that I have been extracting from Burlington Limestone collected this summer. Here are my most confusing teeth that hopefully can receive identification from our forum experts. 1. 2. 3. Possibly a dermal denticle instead of a tooth? 4. 5 .
  11. ThePhysicist

    Chondrichthyan? denticles

    From the album: Harding Sandstone

    Chondrichthyan? denticles Tezakia hardingensis Harding Sandstone, Canyon City, CO, USA These are possible Ordovician Chrondrichthyan (class of cartilaginous fish including sharks) denticles, if true, these would be the earliest known. Described by Andreev et al. (2015) and Sansom et al. (1996) ^Andreev et al. (2015)
  12. minnbuckeye

    Chondrichthyan Unknown

    I was working through some Burlington Limestone, Mississippian looking for the Chondrichthyan fossils found within. Most primitive shark teeth in this matrix are fairly small, which is why this unknown surprised me when discovered. My suspicion is Deltodus except for the massive size. I welcome all thoughts on this ID. Unfortunately the missing pieces were not found. @Elasmohunter, this one's for you!!!!!!!!!!
  13. Here are a few holocephalian teeth from the Pennsylvanian LaSalle Limestone from Illinois that I have been unable to ID. I find these teeth hard to ID since the tooth plates of a single species are often so varied in morphology, and I can rarely tell if I'm looking at a fragment or whole plate. Hopefully someone more experienced than I can tell. For the first tooth, I tooth a picture in situ before trying to split the boulder as I was afraid it would crack. Well it did unfortunately and I was only able to save a few pieces. This second tooth looks like Psamm
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