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Found 266 results

  1. I recently came across this very old paper (1899) that discusses an unconformity in the Silurian limestone of Illinois, in which a small lens of Devonian rock was found. The matrix was particularly packed with a variety of fish teeth, including two new species. I, along with the author, found this quite interesting as the nearest Devonian outcrop is 80 miles away in Milwaukee – the Devonian is just not well represented at all in Illinois. In fact, this is the first time I've heard of Devonian fossils coming from Illinois, although the paper indicates that there were outcrops in Illinois to the west, although by over 100 miles. The paper is not super specific on the location of the quarry in question, although it is within 30 minutes of my house. That said, this is a discovery over a century old, so the quarry is certainly filled in by now. Hope some Illinois residents find this interesting. Just goes to show that significant finds can occur in the most random of places. elmhurst_devonian.pdf
  2. This came from a quarry in Kankakee county near Manteno, IL.
  3. Pennsylvanian Aged Mystery Fossil

    This is a very odd fossil that I collected from a Pennsylvanian aged black shale site in North Central Illinois. i have been collecting this site for many years and have never found anything like it. The specimen measures approximately 3”. The site primarily consists of a Thylacocephalan type arthropod along with a variety of fish and a few nautiloids. it is very similar to the Mecca Quarry Shale of Indiana. My best guess is that it is some type of nautiloid or possibly a spiral coprolite. Any suggestions would be appreciated.
  4. Found this small (presumably fish) bone fragment last weekend while at my usual Pennsylvanian (Upper Carboniferous) limestone roadcut in northern IL. Not really sure what to make of it. It's small, not even 1cm long. My only guesses were either a partial jaw of some sort, or maybe a small fragment of a spine. Any thoughts? @jdp @Fossildude19 @deutscheben
  5. Hi, everyone, it's been a minute -- I hope y'all are well and that you and your families are healthy and safe. I'm required to say "y'all" since we moved to New Orleans last summer. Fantastic city, great people, but I won't be peeking in the Chesapeake or anyplace else on the East Coast again any time soon. Then, *this* all happened. During this lockdown, it occurred to me that I could finally get around to trying to identify some of the material I've had sitting in boxes for years (and I'll post a few others). But what do I find when I log onto the FF after ages? A positive gaggle of Mazon ID posts. Love it! I collected this little fish in 2010 from the South Unit at Mazonia-Braidwood. He measures a whopping 13mm from nose to tail. I've been poking around on the web but I'm having a hard time with the ID. It looks like he has two spiky fins sticking up from just behind his head (they're clearest in the last photo). My brain itches with knowing that I've seen this guy someplace before, but I just can't find him again. Thoughts? Thanks...y'all.
  6. Another Mazon Creek ID thread

    I wanted to join the squad of great Mazon ID threads we have had in the last week. These two were found split on my opening day trip to Mazonia-Braidwood/Pit 11. I only found half of the first one. It doesn't look like much, and it may be nothing, but its worth asking! The second one was split, but both halves were present. It is much more clearly something, but I'm not sure what, as there are not any clear features, although it is preserved with good definition and a nice contrasting color.
  7. Local Silurian

    Yesterday I decided to make a quick trip before the Illinois stay at home order took place. For the past 4 years I've been trying to find all 16 of the trilobite taxa in the Sugar Run formation. So far I've found 12. The lichids are eluding me, except for a partial Trochurus welleri found last year. Here is what I think is a lichid fragment (?) Dalmanities illinoisensis pygidium continued...
  8. Mazon Creek ID help

    A few nodules I need help ID with @Nimravis. Essex biota and found in Pit 11. Thanks! #1.) I think this is some type of worm? #2.) Thanks for the help! I may be adding some more in the next few days for ID
  9. Cheirurid ID

    Would this specimen be described as Cheirurus cf. niagarensis, or Ceraurus hydei, Weller? Sugar Run formation.
  10. On March first, I decided to rent a car and drive south. I'm finishing school in Chicago in May and am preparing to move west, so I really had no time to waste collecting Illinois. I hit three spots - one limestone road cut and one shale road cut in Oglesby, IL and the Mazon pits on the way back up to the city. I'm grateful to a few members for their posts and message replies regarding the road cuts, I couldn't have done this trip without them. I took off at 7 AM towards Oglesby. Here's the map, if you look at Oglesby on Google maps the location here should come together: Once you're there, it's basically a free for all. You are searching through the LaSalle Limestone Member of the Bond Formation which houses Pennsylvanian fossils. There are brachiopods everywhere you look which crumble down the hill and expose new matrix. Here are some of the Linoproductus I took home: I'll make another post for the second road cut
  11. Mazon Creek Insect Wing or Leaf?

    This concretion from the Mazon Creek area Chowder Flats site split earlier this week but I just had a chance to examine it today. It preserves a narrow ~10 mm long veined object, unfortunately with a portion missing from the middle. The shape and venation makes me think of an insect wing, but it could certainly be a partial leaf of some sort instead. I would love to hear thoughts from anyone with more experience. I had to take the pictures through my loupe since it is so small- the first two are of the part and the third is the counterpart.
  12. My granddaughter and I are coming to Chicago from 3-29 to 4-4. We’ve looked for Petoskey stones along the shores of Lake Michigan in Michigan, and found a few small fossils, but we don’t know how to hunt for them or what to look for or what equipment we would need. Any info would be helpful. We are looking into Mazon Creek, but a lot of what I’m finding is that it’s all picked over. Any other sites that would be good for two beginners? Thanks!
  13. Hello. Today was the Des Plaines Valley Geological Society Show. There were many dealers selling gems, minerals, fossils, and jewelry. Here are some pictures.
  14. Who is going to be heading out to Mazonia-Braidwood State Fish and Wildlife area for the start of the Pit 11 fossil hunting season on Sunday? They are forecasting a high of 58 degrees right now, practically t-shirt weather! (but watch out for those ticks) I am planning to be there Sunday and Monday, my first time trying two consecutive days. I hope to run into some other fine forum members out there.
  15. Genal spine?

    Came across this small fossil (4mm). It appears to be a ventral genal spine, but I could be wrong. Upper Ordovician. Any idea what species?
  16. My great grandfather majorly shaped who I am today by getting me introduced to biology, paleontology, and earth sciences at a young age. He left me with many fossils that he had gone out and found himself, picking about in the Mazon Creek Formation of the Carboniferous. Among the ferns and leaves I had found this one, it looks a lot like a negative impression of an invert to me, although I could also see it being a leaf impression. I'm pretty immature so I'd appreciate any help, thank you
  17. I am wondering if there are places that have a community prepping lab, where equipment is shared between members and people can give advice and help each other out, similar to a maker space? If there are places like that could anyone point me to one somewhere in Illinois preferably close to central Illinois.
  18. Mazon Concretion

    Hey all! Just bought this piece at a rock shop here in Chicago. It was sold to me as a shrimp, the shop owner was pretty confident in this, but I'm pretty sure it's a fern instead. Not disappointed since I just appreciate the composition here, it's a super pretty one, kind of off-beat. Can anybody help ID the exact fauna? Thanks so much!
  19. I’m hoping someone on here has some spare matrix from the Mississippian Golconda Fm in southern Illinois. The roadcuts near Anna and Vienna are pretty well known (I know a few members here have hunted there), but at over 6 hours away it’s a bit too long of a trek for me right now. A recent paper on microfossils from there piqued my interest and I’d like to try and process matrix to search for some. If you have any, PM me and we can work something out.
  20. Sites in Lake County?

    Hello, I has wondering if anyone here knew of any fossil sites in lake county as I haven't been able to find any online I think I found a spot near a friends house called Kellogg creek but I haven't checked it out yet because of the cold and snow but Ive been there before and its like a ravine so I thought that could be a possible spot. Any suggestions are appreciated
  21. Managed to stop in for a little Mazon Creek style Easter egg hunt when I was up in Chicago last June. Brought back maybe a gallon or so of concretions and I've been cycling them in my freezer (when I remember). I like to give them a bit of a (gentle) tap around the edges from time to time. This often helps the concretion to shed an outer layer or to coax a split that is nearly there and just begging to pop. As expected, I've had a number (the majority) of concretions open up to reveal a complete lack of anything at all within. The only thing that revealed itself to be of interest was this little concretion that measures 3.5 x 4.0 cm. I pulled out my copy of The Mazon Creek Fossil Fauna book and you think with that information at my fingertips that I'd be able to make a coherent guess as to the identity of this fossil but I am at a loss to match it up convincingly to any of the taxa described there. Hoping some of the members here with more experience can chime in. @Nimravis @RCFossils @stats @Mark Kmiecik
  22. Over the past year, I've become fascinated with the often bizarre fish and sharks of the Pennsylvanian. Fortunately, my home state of Illinois is a great place to hunt for such fossils. I've shared several of these in other posts before, but wanted to put everything together in one thread. Probably won't have much to post for a few months after this, but once summer rolls around, I should hopefully have plenty of new finds to share. I would say there are three major settings in which you can find fish fossils in Illinois: Mazon Creek, black shales, and limestone. I have not had luck at Mazon Creek yet, but hopefully that will change. So I'll start out with the black shales. These specimens, my first fish fossils, were collected in August 2019 from the Mecca Quarry Shale exposed at a clay quarry in Utica, IL. This shale directly overlies the Francis Creek Shale (i.e. Mazon Creek) at this location. The three specimens below are stomach ejecta from some kind of fish, and are composed mostly of partially digested fish scales. In addition, I found this very nice pair of associated acanthodian fin spines. The top fin has an area showing damage, possibly due to predation.
  23. Claw or strange rock?

    Here is a 45 second closeup video of a claw shaped rock. I found it in a creek in North West Illinois, Whiteside County USA. I took it home just in case it actually was something other than a rock. What do you guys think. Thanks for the help. Claw or Rock Video
  24. Does anyone have experience with the Middle Ordovician brachiopod faunas of the upper Mississippi Valley? I came across this odd fragment in rocks from a quarry in south-central Wisconsin. To my knowledge they are known in North America only from the Appalachian Basin (Tennessee, Virginia, West Virginia, Pennsylvania, Quebec, Newfoundland), not the interior basins like the Illinois basin. Has anybody else seen this critter or similar in the Platteville? As far as I am aware, the only species documented from the Platteville that looks anything like this is Megamyonia unicostata, but that has a single costa rather than the several apparent here and in the types of Ptychoglyptus. Platteville Fm, probably in P. undatus biozone = Upper Ordovician, Sandbian stage (old North American Turinian Stage)
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