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  1. Sauropod19

    Mazon Pit 11 ID

    Hello again. I got the time to scrub off my finds from Friday and found one of interest (and a second that I haphazardly split open that I think is a dud). The top one’s shape remained after several rounds of intense scrubbing, and feels slightly 3D in the middle. Other views of top one: Is there anything in the top one or is it just suggestive mineral staining? Additionally, since there is a crevice present around the entire perimeter, would you recommend I try and pry it open or leave the concretion as is? Lastly, just so I can document the correct number of concretions collected on my permit, which of these four examples (if any) would you consider to be a concretion or half concretion. “a” and “d” are extremely thin, both likely part of the outer “shell” of a concretion. “b” is just an odd shape, and “c” is thick but flat. As always, thank you!
  2. Hello. I’m currently at Mazon and after about 1 1/2 hours of intermittent hiking and searching, I found a hillside that seems to be rife with concretions. I’m somehow lucky enough to have a tiny bit of cell service. I am concerned, however, that I have stumbled upon someone’s discard pile rather than a concretion gold mine. Most of the 100+ concretions were found either on the surface or very slightly embedded in the soil within a 30 foot radius, and most have jagged edges and are only half a concretion. A couple have even been larger than my hand. As such, I know it is difficult to tell without being here, but is it more likely that I’ve found an area where concretions have been exposed and opened naturally or have I stumbled upon someone’s recent search area? Thank you! P. S. I brought these together in one pile from around to demonstrate the majority of my finds. In situ: Large:
  3. AnomalyShrimp

    Mazon Creek circular nodule ID

    Hello! A couple weeks ago my family and I drove to Mazon Creek and found our first nodules. I was keeping my eye out for the tell-tale round layered shale, and picking up already split ones too. I also saw a similar thread posted recently, just want to confirm if these are indeed duds or not! Most of the finds are about 3cm #1, The most intriguing one to me #2 #3, all of them together to show frequency and variety of circle pattern Thank you very much for reading!
  4. Tom16

    Mazon Creek Fossil ID Help

    Hello, I opened/cleaned off some nodules I had collected recently and I am unsure if they are fossils or just formations of how the rock separated. Thank you in advance for your time. Also, if anyone has any recommendations on fossil books, that would be appreciated. 1) I am not sure if my eyes are lying to me or not but I see what could be a shrimp. I see the formation of a shrimp body. Also what appear to be two eyes and a nose. Again, maybe I am just seeing what I want to see. 2) Not really sure what this could be. I did not think it was anything at first but then I opened another nodule (3) and saw the same formation. Possible bivalve? 3) Same as 2
  5. Hello, While searching for concentrations in Mazon Creek, IL, I discovered you can find Crinoid stems in rocks around the area. I have found a few of those but recently I found a couple that are similar but not as easily identifiable. Below are the two samples in question. Thank you for your time and assistance with the IDing. 1) This sample is very similar to the type of rock I find the Crinoid stems in. Seems to be like fossilized coral with the holes. Specifically, I am looking at the spiral with a bump in the center. I think that is an impression of a Crinoid stem that was there before but not sure? 2) This sample is a different kind of rock it seems. It is lighter in color and has some sparkles in it. The feature in question is the 'flower bud' type formation I see in the top center of the rock. It is smooth and it has depth. Compared to how the rest of the rock is rough, I have to imagine this is something different.
  6. Tom16

    Mazon Creek Nodule Questions

    Hello, I am new to the fossil finding hobby. I have been finding nodules with no discernible fossil but are different than others. If anyone could tell me what these are, that would be great. Thanks for your time. These 2 have grey circles in the center. Are these just mineral deposits? This one is similar but it also has crystals in the center, almost like a geode? Then I also find nodules like these that have this strange inner part.
  7. Misha

    Peachocaris strongi

    From the album: Misha's Carboniferous

    Peachocaris strongi Crustacean Mid Pennsylvanian Francis Creek Shale Mazon Creek Lagerstätte Illinois
  8. Misha

    Essexella asherae

    From the album: Misha's Carboniferous

    Essexella asherae Cnidarian Mid Pennsylvanian Mazon Creek Lagerstätte Illinois
  9. CrustaceousBaki

    Mazon Creek ID help

    Earlier this week I had 2 concretions pop open that I weren’t too sure of what they were. Number one has the calcite desiccation cracks that are consistent with Achistrum sp. I guess the shape is what is kind of throwing me off, and the body seems to segmented, which reminded me of a millipede. Number 2 I cant really see any discernible features in it at all but if I had to guess a type of a polychaete worm? Anyway I’m gonna leave this to the experts lol. Any help is appreciated!
  10. Oxytropidoceras

    Is the Tully Monster a vertebrate?

    New details of Tully monster revealed 3D scanning of enigmatic fossil may have brought an end to debate about whether it is a vertebrate or invertebrate University of Tokyo, Nature, April 17, 2023 70-Year-Old Mystery Over Bizarre 'Tully Monster' May Finally Have Been Solved Science Alert, April 18, 2023 The paywalled paper is: Tomoyuki Mikami, Takafumi Ikeda, Yusuke Muramiya, Tatsuya Hirasawa, Wataru Iwasaki, Three-dimensional anatomy of the Tully monster casts doubt on its presumed vertebrate affinities, Palaeontology: April 17, 2023, doi:10.1111/pala.12646. Yours, Paul H.
  11. Hi all! I have a few questions from the massive amount of new info I’ve learned on here since I started collecting 3/124 at pit 11. I’d went just one time before w my dad back in probably 1982 or so, I have visions of just concretions everywhere, and hammering lots of random rocks, it’s always been a great memory in my mind. It’s been along time, and it’s juuuuust a bit harder to collect now, but I don’t mind the army crawl in the woods, and my 16 year old loves rocks and fossils, she’s having a blast with me. I’m not trying to reinvent the wheel in the freeze/thaw method or anything but I see a few different methods mentioned on here and had a question. I’ve been soaking them in single file layers in several trays(for 2 full weeks before I start the freeze), then removing the tray and draining all the water and then it goes right into the freezer. A few hours later I remove from the freezer and the tray goes right back into the water to thaw, and I rotate a new set into the freezer. 5 trays in the freezer- A set in the water It’s a lot quicker this way and I can get several cycles a day. I can’t imagine the concretion loses any water in the brief time it takes for the outer shell to freeze - but I’d prefer to ask the question instead of assuming! So for you long time Mazon masters, is this ok? Also - ok let’s say your out collecting, you find an open concretion that is obviously something more rare, not an Essexella, but it’s covered in deposits. Or one pops in freeze thaw and it is also covered in deposits. Do you just do the 25% vinegar and gently brush with cotton or something soft? I’m pretty sure I’m being too rough on some of these and am removing the remaining fauna fossil material. I’ve searched and I can’t find much detailed description on prepping anything from Mazon Creek, just bone fossils, trilobites and shale fossils etc. Anyone here have a YouTube channel where they prep/clean Mazon concretions or a book to recommend? Lastly - I had an idea to ask “Take it or Leave It?” I’ve collected a lot of smaller concretions that have more of what looks like sediment layers, and are not the perfect looking concretions. The first freeze thaw has turned lots of these to mush/pieces. To the long time hunters - would you have left these? 1 2 3 - both sides 4 Thanks for taking the time to read all that! Patrick
  12. Patrick K.

    Mazon Creek ID help

    Hi All! I have a lot of concretions soaking for freeze thaw, but while I wait I have a few of the open ones I found that were pretty covered in mineral deposits, that are now cleaned. I know most are probably not ID-able, but I would love help with some identification if possible! This first one is my favorite - the might be a molt or badly preserved animal but there are some clear abnormalities that I hope can get me an ID or at least narrowed down to some guesses? Mainly the 4 antennae or possibly tails (like in a mayfly) - they are only visible from certain angles, and in some of the pics, so my kiddo added drawings along the tails/antennae in one image - they run clear out of the edge of the concretion. Also an area that looks like wings or legs. #1 2 3 4 - both sides 5 - I wish this was a fish - I doubt it is or can even be ID’d but my daughter can make any of my badly preserved fossils look like fish on her phone editor - it’s pretty amusing actually. The center has signs of a skeleton or maybe plated carapace, hard to capture in pictures. Here is the fossil and one w w her artistic additions 6 - the problematic H? 7 - bark? 8 - more bark? 9 10 11 - I lost the other half to this one - I forgot to zip up my backpack while army crawling in pit 11. And I think I messed up the vinegar soak and ruined some details. 12 - I can not get a good picture of this. The animal looks to have been smooshed like a T along a ridge right in the middle, it was covered in deposits. The really looks like what I saw in RCfossils gallery and Google images - Gilpichthys greenei - I can 100% see the shape, just no details. 13-Lastly this large concretion that looks so odd. The edges were broken off both sides so perfectly before it opened at some point it almost looks cut. This little chicken neck looking thing is all that is there. Thanks in advance! Patrick
  13. CrustaceousBaki

    Mazon Creek ID

    Finally after a streak of bad luck with my concretions I think I’ve found something. First concretion I am almost certain contains something. Looks to me like a worm (?) Second I’m not super confident on but looks different from a lot of the other duds I’ve opened. Wouldn’t have much of an idea of what it could be. Third definitely also looks like something to me, one half did break a bit but I should be able to fix that. I hope the pictures are in order! I will try to fix if not. (I put the penny for scale if that helps)
  14. Howdy all, I'm a pretty new fossil collector (but experienced GIS user) who has been doing some remote scouting of Mazon Creek locales based on some internet scrubbing. I will be heading to Pit 11 on Thursday. Would any of you more experienced collectors be willing to critique my marked spots via DM? I want to make sure I make the most of the trip!
  15. Patrick K.

    Mazon Creek Pit # 11 ID Requests

    Hello all! Had a successful hunt with my 16 year old daughter last week, we both came back with heavy backpacks and smiles on our faces. I have a lot to freeze/thaw, but I had a few open partials (that were not Essexella ) that I was hoping were not weathered past ID'ing. These were covered in deposits and the edges are pretty rounded which leads me to believe some were open for quite some time - and I am not extremely gentle with those ones when prepping/cleaning. But still happy with the 3rd trip out ever! 1 - It has some bumps/raised areas close the the break and smooths out, and since it is broke, I can see the fossilized organism was pretty thick - maybe stick or fish tail? 2-pretty small - has that white fossil material that is not from the elements though - 3 - just a circle but has the white fossilized material 4 - worm of some sort - no visable mouth parts that I can see - 5 - another worm of sorts - # 6 - Stem? I so wanted it to be a blade! # 7 - Some sort of shrimp or molt? This one is strange - has a groove/indentation/valley that runs from the center of the object to the upper right corner in this first image - it is just odd looking. # 8 - Lastly this one - maybe one of those tunnels I read about in the Esconi book? just a little half circle valley that ends at the white deposit. Thanks in advance, I appreciate the help! Patrick
  16. Patrick K.

    Mazonia North / Pit 14

    Hi all! Can anyone point to any info on mazonia north unit hunting? I believe it’s pit 14 from some maps I found on the Google machine, but not certain. I took a kayak trip on Clear Lake on the south side of the north unit and did a bit of fishing and some hunting - it’s mostly overgrown with a thick grass but I did find a section where the bank had given way and it had some odd concretions - nothing like pit 11. I took half a bucket home just cause I was there and figured why not - doubt they are anything. Any help would be greatly appreciated - any books that have the history of the mines and what’s been found at each pit? Thanks! Patrick
  17. My family (kids 4, 7 and 10) attempted our first foray for Mazon Creek fossils last week. We had a blast! Took it slow, explored the lay of the land and came back with around 300 concretions to freeze/thaw. Definitely a more ideal time of year to go with young kids, easier to see paths/where we were going and keep track of everyone, only one tick and no poison ivy etc. to worry about, just thorns. We ended up derailing onto some deer trails and bushwhacking through, but we also found some fun things that way. Main trails were very easy walking and the kids found enough concretions to stay entertained. GPS tracking was perfect, had whistles, camelbaks backpacks for all but the 4-year-old, snacks and rubber-coated gardening gloves plus a few kid-sized rakes. Permethrin on our clothes and picaridin lotion worked well. Pics below of some open finds (jellies, which for us novices is wonderful! We cleaned them up best we could, some are worn but that doesn't matter to a kid's collection!), then some unknowns. My husband found a great worm (we think!) of some kind. Pics below, and a few unknowns at the end. We spent Friday at the Field Museum to see their Mazon Creek exhibit. We hunted for a half day Wednesday and full day Thursday. A great weekend-type trip as a full week would be too tiring for us all. We will for sure go again, but may stick to spring before poison ivy etc. take hold. I'll update the post later with anything from our freeze/thaw cycles. Started soaking today! Few more pics next post.
  18. Hi all! Talk about pure luck, on my second trip to pit 11 ever, I found this crawfish(?)! It was in 3 pieces and I was lucky enough to find all 3. Needless to say I super excited…I’d have to guess it’s pretty a rare find. It cleaned up really well after a few 25% vinegar baths and the slightest brushing with a very soft artist paint brush. When it split at some point, part of the top didn’t separate with it, it was covering the tail which I reallllllly wanted to see . I noticed a small crevice on the side of the concretion and figured I might be able to get the imperfect separation to pop off. After a few partial freeze/thaws, that part popped off so I have full exposure of the body! I’d love an ID on this if anyone can help. Thanks in advance! Patrick
  19. Patrick K.

    Mazon Creek ID

    Hello all - I had put this aside as a typical Essexella asherae (jellyfish) but after cleaning, I was unsure. It doesn’t have the base and this one has much more pronounced ridges/waves than any of the other of the ones I have. There’s 2 sets of images under different lighting. Thanks in advance! Patrick
  20. In a nod to Ralph’s entertaining post, I thought that I would start a thread that I can continue to add on to over the upcoming months. With the Pit Eleven collecting season coming to a close, I decided to venture out one more time before the season ends on September 30th. Pit Eleven is a difficult site to collect due to the heavy overgrowth (lots of thorny plants), uneven terrain and did I mention the bugs. Late Summer/early Fall is especially tricky because unlike the Spring, the vegetation is in full growth obscuring many of the areas that can produce early in the year. The one upside is that the lake water level is a bit lower so I decided to explore a few more out of the way areas that I do not search very often. It paid off in a big way. In just a few hours, I was able to collect 514 concretions! Many have nice shapes and I might even have a Tully or two. While it is likely that at least half of them will be “duds” I have a decent chance of having something rarer pop open. Since we will be heading into the Winter months soon, I thought it might be fun and informative to share the results of my freeze/thaw cycles with the forum. I will try to update this post with each cycle (probably around once a week) posting pictures of any interesting finds. I will also keep a record of all plants and animals found in the 514 concretions. In my experience, most of the better quality fossils will usually split open within the first 20 cycles. I am currently soaking the concretions for a few days and will buy them in my chest freezer early next week. I did find a few concretions that had already split open that I am not including in this count. Two were the common Essexella, one Aviculopecten, one coprolite and a few small plant fragments. I also found an interesting artifact. A section of rail line (approximately 30”) from the old mine carts. Here are a few pictures of the concretions. Enjoy!
  21. Tom16

    Mazon Creek Fossil IDs

    Hello, I recently posted about my second trip to Mazon Creek in the Trip Forum. I added some pictures of my fossils to ID but I believe that was the wrong forum to ask that in. I am now posting those pictures in this forum so I can get some more help. Below are some of the fragments I found. I apologize if this is excessive posting. Thank you in advance for your time to ID. The pictures below I believe are jellyfish 1) 2) Below are some I believe could be Tully fossils. 3) Looks like the fin? 4) Could be the body 5) Looks to me to be a beak, not sure if any other creatures found in this area would also have one? Very smooth to the touch. These are fossils that I have no clue what they could be. These were already fractures when I found them so some of the fossil could be lost. 6) 7) 8) Tried to clean this one best I could. Kind of resembles a leaf to me. 9) Strange grooves that go in a circular shape. Also a big divot that almost leads to a stem like opening?
  22. Hello, just went to amazon Creek today. Convinced myself to go out even though it was snowing haha. Well worth the trip though. Got very lucky to find my first concentration of fossils. I believe I got some jelly fish and possibly some Tully monster parts? Let me know what you think! I believe the first 3 could be a Tully monster (beak and body parts). The next 3 I believe are jellyfish. The final 3 I am unsure about if anyone. If anyone has any ideas, let me know! These are all fragments too. I have some unopened ones I am going to soak then freeze. Will update when I get those results.
  23. Hello from Wisconsin! My husband and I are bringing our 10, 7 and 4 year old kiddos to the Pit 11 area at the end of next week for a couple days to try to find some fossil concretions. I have the Wittry book, joined ESCONI, and have read this forum thoroughly and am grateful for all the info provided by you wonderful experts, thank you! I am realistic however that a 4-year-old is going to limit just how much walking we can do, especially as it's rough terrain. Could someone please confirm whether it is okay to just park alongside the road *anywhere* around the Pit 11 area? Specifically W5000 North, Merchants Rd (route 6) and Kankakee? Trying to shorten our walking distances as much as possible, but don't want to be ticketed or towed! I could always have my husband drop us off and go park in the lots, but it would be good to be closer to the vehicle throughout the days for multiple reasons. Also, am I right to be concerned and cautious about venomous snakes? Seems like this would be prime territory, I know it's early spring so not as likely, but stepping into a copperhead den is a concern when exploring with young kids. Thank you so much for any feedback!
  24. Nimravis

    More Mazon Creek ID’s

    @RCFossils @stats @connorp @Mark Kmiecik Here are a couple more that I put to the side and do not recall if I looked for ID’s in the past. I just can’t feel comfortable with an id on this worm, what do you think? It is a cutie. 1. 2. This is reminding me of an Octomedusa, but do not recall seeing one with this type of preservation. 3. Here are Three Amigos- any ideas?
  25. Nimravis

    Mazon Creek ID’s

    @RCFossils @stats @connorp @Mark Kmiecik I do not think that I have posted these unknowns that I have. If I have, I do not have an ID. What do you think about these 8 pieces?? 1. 2. 3. 4. 5. 6. Hystriciola delicatula?? 7. 8.
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