connorp Posted October 18, 2019 Author Share Posted October 18, 2019 13 hours ago, deutscheben said: That is a very cool tooth! I love the color and the unusual stippling pattern. I don't think it is Peripristis, as it does not look like any of the examples I have seen. But I don't know what it is- there are a number of Pennsylvanian genera with a similar low jagged ridge shape, like Chomatodus, or Venustodus... perhaps @Archie or @Elasmohunter or one of our other Carboniferous tooth folks have an idea? Yeah I was definitely spitballing on the ID. I have very little knowledge about chondrichthyans, but these teeth are quickly becoming my new fascination. Link to comment Share on other sites More sharing options...
connorp Posted October 18, 2019 Author Share Posted October 18, 2019 Here's another cool find, which I only recognized thanks to @deutscheben's recent trip report from here as well. A nice association of a crushed brachiopod with spines attached and a crushed Archaeocidaris urchin. At first I thought only isolated spines were present but it appears that the test is partially present as well. 1 Link to comment Share on other sites More sharing options...
JohnJ Posted October 18, 2019 Share Posted October 18, 2019 Could you point out the parts you are attributing to Archaeocidaris? The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
connorp Posted October 21, 2019 Author Share Posted October 21, 2019 On 10/18/2019 at 1:27 AM, JohnJ said: Could you point out the parts you are attributing to Archaeocidaris? The leftmost spine on the bottom certainly looks like an Acrchaeocidaris spine to me. That said, I'm not longer sure if there's any more to it. None of the other spines display any sort of protrusions, and what I first through was the test may just be conspicuously placed debris. I'm going to try and prep it out a bit more. Link to comment Share on other sites More sharing options...
connorp Posted October 21, 2019 Author Share Posted October 21, 2019 On 10/17/2019 at 1:38 AM, connorp said: Turned out to be a spectacularly gorgeous shark tooth. Only a partial, but I'm still ecstatic. Not sure on the ID, maybe Peripristis? I believe I found an ID on this guy – Cymatodus oblongus. It was described from a single tooth in the Geological Survey of Illinois Vol. 4. (Figure 7a) Here is a related tooth Paracymatodus from the Pennsylvanian of Russia (Handbook of Paleoichthyology Vol. 3D). The stippling pattern is very similar to mine. 2 Link to comment Share on other sites More sharing options...
JohnJ Posted October 21, 2019 Share Posted October 21, 2019 42 minutes ago, connorp said: The leftmost spine on the bottom certainly looks like an Acrchaeocidaris spine to me. That said, I'm not longer sure if there's any more to it. None of the other spines display any sort of protrusions, and what I first through was the test may just be conspicuously placed debris. I'm going to try and prep it out a bit more. It hard to see detail in the photos, but in general, Archaeocidaris spines are more 'saw-like' than branching. This looks more like a possible fragmented bryozoan or brachiopod spine to me. The human mind has the ability to believe anything is true. - JJ Link to comment Share on other sites More sharing options...
deutscheben Posted October 21, 2019 Share Posted October 21, 2019 1 hour ago, connorp said: I believe I found an ID on this guy – Cymatodus oblongus. It was described from a single tooth in the Geological Survey of Illinois Vol. 4. (Figure 7a) Here is a related tooth Paracymatodus from the Pennsylvanian of Russia (Handbook of Paleoichthyology Vol. 3D). The stippling pattern is very similar to mine. Very intriguing, that does look like a close match indeed! Good research on that one- if correct, that seems like a rather rare genus. Regarding the spine, it is hard to tell at that level of magnification, but I do think I see the branching @JohnJ was referring to- under magnification are these seeming projections more apparent? 1 Link to comment Share on other sites More sharing options...
Archie Posted October 21, 2019 Share Posted October 21, 2019 Awesome finds! That tooth is gorgeous! 1 Link to comment Share on other sites More sharing options...
connorp Posted November 1, 2019 Author Share Posted November 1, 2019 Here’s one of the nicer Maquoketa hash plates cleaned up a bit with vinegar. There is this one bit that caught my eye. Seems similar to the Isotelus bits I’ve collected from St. Leon. Thoughts? 1 Link to comment Share on other sites More sharing options...
minnbuckeye Posted November 1, 2019 Share Posted November 1, 2019 3 hours ago, connorp said: Isotelus bits That is my impression. And the Maquoketa in my area is full of Isotelus. Mike 1 Link to comment Share on other sites More sharing options...
Al Tahan Posted November 1, 2019 Share Posted November 1, 2019 Awesome collecting Conner! Love the hash plates 1 Link to comment Share on other sites More sharing options...
Elasmohunter Posted November 2, 2019 Share Posted November 2, 2019 Awesome finds! I'm jealous. 1 Link to comment Share on other sites More sharing options...
connorp Posted November 17, 2019 Author Share Posted November 17, 2019 Made a second trip to hunt the Maquoketa two weeks ago. Didn’t stay long due to the high water and piles of leaves. This was a nice find for me. A nearly complete Isotelus hypostome. Link to comment Share on other sites More sharing options...
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