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  1. Sauropod19

    Mazon Pit 4 concretion

    Hello! I had the privilege of joining ESCONI to Mazon’s Pit 4 yesterday and came across this concretion. There’s a very good chance it’s nothing, but I thought the 3D shape might be peculiar. The concretion is about 1.5 cm wide in total. Thank you for looking!
  2. trilobites_are_awesome

    Possilble mazon creek insect?

    Is this a Mazon creek insect? It has these strange lines on the front. thanks for your time Trilobites_are_awesome.
  3. I have a lot of unopened Mazon Creek concretions and though I do put some out in the winter for the Freeze / Thaw process, the vast majority, especially the larger ones do not open. So to dwindle my concretions, I have no problem whacking them with a hammer, and that is what I was doing today. As we all know, this is not the best way to do it since it can damage a nice specimen, but I take my chances. I always picked up any concretion that looked promising and never passed up larger ones. This all depends on the are that you are collecting, concretions from Pit 11 are never super large, but Pit 4 always produced larger ones - see below. Though these are large, they are by no means my largest. The vast majority of the time there is nothing inside, like the one below. Other ones produce something nice, like this Alethopteris that I cracked open today. Cleaned up_ A couple of my other finds from today, nothing spectacular, but is nice to get rid of the dud ones. Neuropteris Annularia Annularia, Neuropteris and Bark Asterophyllites Bark Essexella asherae Jellyfish
  4. Hi all, is this a Hesslerella shermani isopod from the Mazon Creek? It is from the Braidwood area Pit 11 I think it is one but I am no expert in this area
  5. val horn

    mazon creek unknown

    I went surface collecting, looking for fossils near Terra Haute Indiana and and came home with a number of concretions. Most were pretty plant fossils, and one was a plant hash plate and then there was this concretion. I dont know what to make out of it, so any help or suggestions will be very welcome. It is approximately 3 inches by 1 inch , and I am showing upper and lower sides.
  6. Hello everyone! I've been inspired by so many good Mazon Creek topics in this forum, I thought I would start my own. I'll post my own finds, which so far don't include anything as exotic as a Tully Monster, but maybe I'll get lucky on page 134 or so... I have to credit my kids with getting me interested in fossil collecting. I was always interested in rocks and fossils but when my 10 year old son had his dinosaur phase it really sparked my interest again. I wondered if an ordinary person like me could go out and find fossils? So I Googled fossil collecting and found out that not only could I search on my own, one of the world's best sites for amateurs was just 3 hours away! The date I discovered Mazon Creek existed was 9/10/2017. I know that date because earlier in the day was the last ESCONI trip to the Braceville spoil pile for the year - I just missed it! So in May 2018 I finally went on that trip and was hooked. Since then I've gone to Braceville several times, the I&M Canal trip once, and a handful of trips on my own into Pit 11. I want to thank too many people to list for helping me learn about this new hobby. Everyone I've met on the field trips has been so friendly and helpful. And if you have posted something about Mazon Creek on this forum, I've read it. Special thanks to Nimravis for his Sometimes You Have To Whack It thread, which he started the day after my first trip to Mazon Creek - it has taught me so much and I'm so impressed at what a genuinely nice person he is. And Andrew Bach's book from his American Fossil Hunt site is wonderful, so so helpful. With that, onto the fossils (and lots of questions from me). I thought to start I would show some of my jellyfish, all Essexella asherae, I believe. I find it interesting that they are all so different, although they tend to fall into various "types" - some have a distinct "head", others are just faint outlines, some are just cylindrical shapes. #1-3 below are all from Pit 11 - the first two have a distinct head and the other is more cylindrical. For anyone who hasn't heard of Mazon Creek, these fossils are found in siderite concretions from the mid-Pennsylvanian epoch of the Carboniferous period, from roughly 305-310 mya. Cheers! Chris
  7. TheRocksWillShoutHisGlory

    Mazon Creek unknown

    I had a concretion open up. I am confused what it could be, I was thinking some kind of worm, and I thought it had a weird texture and I was wondering if anyone has any insight.
  8. Nimravis

    Mazon Creek Cephalopoda

    I am looking for ID confirmation on these 3 pieces. The first one I found at Pit 11 in the 90’s and the last 2 were found by my Fossil Mentor Walter in July of 1977 and September of 1979, respectively. According to the info that Walter had on those 2 pieces, he brought them to the Field Museum, as he did many times, to show to Dr. Richardson for ID’s. Richardson identified them as Cephalopods. I believe the ID name is Wiedeyoceras. @stats @fiddlehead @RCFossils Found in the 90’s- Pit 11 Found in 1977- Pit 11 Found in 1979- Pit 11
  9. CrustaceousBaki

    Fossundecima? Mazon creek

    So obviously it’s pretty poorly preserved but I’m pretty confident this is a worm (probably Fossundecima?) I’m just not 100% sure if im correct because of how hard it is to look at. Hope I’m not seeing things.
  10. Runner64

    Mazon Creek Collection

    I'll update this thread with my Mazon Collection over the next few weeks. With some good weather out yesterday, I managed to get my first fossil hunt in for the season and will post a report in this topic. I will be moving this upcoming summer which will put me even further from Mazon Creek so I have purchased a few pieces to fill in the genus/species I haven't found yet and will mention if I purchased a fossil. I still hold out hope to find some of these pieces I purchased eventually but will realistically be difficult if I only can make 1 trip a year. Fauna Tullimonstrum gregarium A weathered eye-bar I found on my first trip several years back. There is an eye spot evident under the right light. Still the only piece I have found at this point. Euphoberia armigera (Purchased) Acanthodian indet. (Purchased) Note: Under magnification the scales are present. Cyclus americanus What's a Mazon Creek thread without some Essexella asherae? I still like finding these guys despite the vast amount I have found. Here are a few of my favorites: Note: My largest piece, this is about 6-7 inches in diameter. A couple shrimp pieces. I believe Belotelson magister (Traded for the first one) Here is a cool insect wing from the order Palaeodictyoptera. (Purchased) Now I believe this piece may be a Dasyleptus sp. and if it isn't one, I would love to be corrected! Europops danae (Purchased) Mazonomya mazonensis I'll add to this thread with additional fauna and flora later and will continue to add as I go through freeze-thaw cycles.
  11. On Sunday, I finally went again the Mazon Creek and later a Bond Formation rock formation of Pennsylvanian age, around 300 Million Years ago, in Braidwood, Illinois and Oglesby, Illinois with three friends after some scheduling adjustments. The trip was awesome and we collected a pretty impressive fossil haul. At Mazon Creek, We mainly hunted for fossils around the shores of local power plant cooling pond (which despite apparently having water temperatures that day of 100 degrees Celsius, still had a decent amount of birds resting on-top). We saw also a large rock pile on the other side of the lake, which we tried to get to on foot, but after an hour of walking decided to head back and try our luck next time. We then went to Oglesby. I'm still cleaning most of the Mazon Creek fossils, so for now I'll be showing my and my friends findings from the Oglesby site. It was pretty hot and got a little cut up on the rocks, but the fossil haul collected was awesome!!! Small jumping spider we found at the Oglesby site. A piece of either coral or Brachiopod one of my friends found in Oglesby. Anyone got an ID for this specimen? Pretty Impressive Crinoid Stems collected as part of the day's Oglesby fossil haul!!! But this next specimen is probably one of my favorites from this recent fossil haul. It's a partial Ctenacanthiform tooth tip (Possibly Gilkmanius sp.) on a limestone slab with some brachiopod fossils also attached (of which I put it recently under a dissecting scope). Based on the thickness and size of the tooth, the shark it came from must of been a pretty decent sized animal when alive!!! A pretty descent Neospirifer brachiopod specimen!!! This next specimen was truly an unexpected find for myself as I've seen a Ctenacanthiform tooth from the bond like this in person before (most I've collected and heard about are of a black coloration where this is a mixture of black, grey, and brown). I must say it's very beautiful and definitely from a Ctenacanthiform shark!!! But I'm curious as to what Ctenacanthiform species it could've come from? Any thoughts on its ID you guys?
  12. econ23

    Mazon Creek - Fossil ID

    Hi all, I have been collecting at Mazon Creek for several years, but I have not run into anything like this. This particular example was collected in September of 2020, but I just recently got around to freeze-thawing. Any suggestions on what it could be, if anything at all? Thanks! Ethan
  13. Anomotodon

    Mazon Creek mysteries

    Hey everyone! Here are two of my findings from the most recent trip to pit 11 (Mazonia-Braidwood) that just opened. I would very appreciate any help with ID! 1. This is a worm-shaped structure that I don't think is a polychaete - I am not seeing any segmentation or jaws. The "gap" at the apex (closer to the center of the concretion) seems like some kind of a structure and at the base of it there seem to be some grains concentrated in a circle (see microscope pics). My working hypothesis is a barnacle, Illilepas damrowi, with the "gap" being a slit between the valves? Sorry for the lack of scale, still in search of my ruler. The fossil itself is about 2.5 cm long. Close-up of the slit. 2. I have absolutely no idea what this could be, but the shape seems defined enough to potentially be recognizable. Is this a plant bit? A segment from some arthropod? The fossil itself is only 5 mm. My first thought was a trilobite hypostome, but those obviously cannot be found in Mazon Creek deposits.
  14. Nimravis

    Mazon Creek Insect ID

    I was going through some pieces from a long time ago and am looking to see if anyone has an ID on these two pieces- each one is on 1/2, I do not have the other half. This first piece I think it a partial Roachoid, what do you think? This next piece is small and I am thinking that I am seeing an insect wing, what do you think? @RCFossils @stats @connorp
  15. Anomotodon

    2023 Mazon Creek trips

    Hey everyone! Haven't posted here in a while, and thought I would come back with a trip report. Recently I became interested in Mazon Creek fossils - something unusual for me as a vertebrate person. I finally managed to get out in the field this spring and visit the Mazonia-Braidwood State Park and the Braceville spoil pile through an ESCONI trip. I have collected at quite a few Paleozoic sites before, but this was my first time hunting in the Carboniferous! I went to Mazonia with a friend on a weekend in early April, when there was no foliage and it was sunny outside. I read a lot of threads about Mazon Creek on this forum and we decided to go straight through the bushes to search for the most inaccessible areas we could find. Here are a few concretions. Sadly, both of these turned out to be empty Also found a first Pennsylvanian garter snake Here is our total haul for ~4 hours. The only non-Essexella thing we found already open was this coprolite (?). By the way - if you see any errors with identification in this thread please correct me, I'm still learning a lot about this awesome deposit. Then came the freeze-thaw. I decided to cheat a little and use the -80C freezer in the lab I work in, which shortens the freezing part of the cycle to a few hours. At this point, most of the concretions from this trip have already opened: My nicest and largest Essexella ascherae. Another Essexella (after vinegar). When it opened, I first thought it was some arthropod segment, but I like it anyways. This one is weird. Coprolite? Probably nothing (?), but the pyrite is pretty. A plant of some kind, probably not identifiable. And my favorite find: I believe this is the apex of a Calamites sp. - segments are clearly visible. This concretion didn't want to open for over a month, so I got frustrated and dropped it from the 4th floor of my building as I didn't have a hammer with me... Don't do that.
  16. Hi All! I had the chance to head out last Sunday with my kid and again for a few hours yesterday solo - both times we came back with very heavy backpacks. It’s not easy collecting, but neither of us mind the army crawl in the underbrush. We’re still learning what to take and what to leave - just my 3rd and 4th trip there (thanks to fellow member and friend tom_mo for showing us the ropes and getting me addicted!!) We look for the small water created gully’s in the steep hills, lots of these have been collected over the years but just as many have not it seems. Or maybe the good collectors have just left all the big Essexella and midsized open concretions! Ha It’s so exciting when we find a vein that has loads of nodules - very addicting! I do use a hand held 15$ Home Depot hoe/cultivator to disturb the surface and move moss and leaves, and sturdy gloves to sift through the piles - it really helps. Still have to clean and prep the open ones from yesterday and start soaking these for freeze/thaw - but here’s some pics of the trove from each trip! I’m going to start a separate thread with some questions I have for the long time Mazon Creek collectors - hope you have some time to help a newbie out! Thanks for stopping by! Patrick
  17. Today I stopped at a friends house (Marty H.) and picked up about 10+ bags of Mazon Creek fossils. I have done this a number of times over the last couple of years. I go through them and place them into buckets so I can bring them to the ESCONI Braceville Shaft Mine Trip and dump them out for the participant’s. I like to go there with several buckets full of fossils. I went through a few bags and here are a few pictures of some of their contents. These fossils came from Pits 2, 3, 4, 11 and Dresden Lakes.
  18. I have been gradually splitting the concretions that I collected this May with the ESCONI. I have not found anything earth shattering, but it is addictive. I go down to the freezer each day or two and see what is ready to open. The first three photos are from a 5 cm flat/oval concretion , and the last is from a small 1.2 cm circular concretion I am quessing that these are cnidarians, but any and all help will be well appreciated.
  19. CrustaceousBaki

    Nymph? Mazon Creek ID

    The first one is incredibly small and was really hard to photograph so I apologize for the quality. Looks like some kind of arthropod to me, like an insect nymph? On the last picture of it I circled what appears to be antennae. It’s was really hard for me to capture that on camera but it’s much more prevalent in person. Second seems to be some type of flora? But I think it’s poorly preserved and I’m not sure if it can be identified. Any opinions are appreciated. Thanks.
  20. CrustaceousBaki

    Polychaete? Mazon creek

    This one opened today and looks a little funky. I’m guessing worm. Any thoughts?
  21. CrustaceousBaki

    Mazonova helmichnus? Mazon creek

    Ok I’m pretty sure this is a reach but I’m gonna keep thinking about it until I get clarification. Could this be Mazonova helmichnus? I very highly doubt it is and I’m pretty sure it’s just mineralization but I’d like to know in the off chance it is. Thanks!
  22. I was very lucky to go with the Esconi fossil club this May to collect Mason Creek concretions. I want to thank every member of that club for help and friendliness to a stranger. I brought back a number of concretions. This one certainly has something in it, but it is not complete and I have no idea what it is ( or isnt). All help and suggestions will be greatly appreciated
  23. CrustaceousBaki

    Mazon creek ID

    I’m sorry these photos are probably awful cause my phone quality is awful lol. But I had a few small concretions from mazon creek that opened today and these two im having trouble identifying. 1st reminds me of an egg case but I highly doubt it. It kinda looks like coprolite too. 2nd a bivalve of sorts?
  24. As many of you know I recently bought a Mazon Creek collection from my friend of mine that I have known and collected with for the past 30+ years. Along with the fossils was a lot of his paperwork on the fossils- not where they were found, etc., but pictures and times that he loaned specimens to museums. One specimen was a winged insect that he had loaned to a person from Harvard (Museum of Comparative Zoology- MCZ). Bob did not have a picture of the fossil and kind of thought it was a dragonfly. This person had visited the Mazon Creek Open House that was held on October 27th, 1984, at Northeastern Illinois University, which was the home of the Mazon Creek Project. Bob had brought the fossil to show other collectors and probably to get an id. The person asked if she could borrow it for study at Harvard and he agreed and “loaned” it to her and later received a receipt for the fossil and personal letter from her. That was the last time he had ever heard anything about the fossil. This has always been a sore subject with Bob and he would mention it all of the time, and that is why I have always been turned off to loaning any specimens. A couple months back I told Bob that I was going to reach out to Harvard and see if they could tell me anything about the fossil, since it was never returned. I sent a nice e-mail to them along with PDFs of the receipt and letter. About two weeks later, I received an email response from a Curatorial Associate at MCZ Harvard. She advised me that they looked at all of their Mazon creek fossils and could not find a particular fossil that I was describing with the information and # that I had for the specimen. Mind you, the receipt had a number assigned to it as well as what it was, as far as their identification (Spanidoera). She did send me an attachment, that contained all of their fossils from Mazon Creek. She further advised me, that after the person that borrowed it left Harvard, she went to another school to get her PhD and then advised me where she might be currently working. I thanked her for the information and that she advised me that they will continue to keep an eye out for the fossil. I then did some more searching, and I actually found the person that I had been looking for and an email address for her. I sent her an email and attached the same email that I sent to Harvard and I expounded by stating that I was Bob‘s friend and that he has talked about this for the past 25 years. She got back to me and stated that she was on vacation and when she arrives home, she would look through some of her old boxes from MCZ, but also stated that it could be in the MCZ Collection , but hard to locate. I thanked her and waited for a response. She got back to me on Wednesday and advised me that she was going to go through the boxes over the weekend. A couple of hours later I received a follow-up e-mail from her advising me that the had found the fossil and it matched up with the number that was assigned to it. I was so happy. I asked her to send me some pictures of it, which she did. She sent a very nice email, apologizing and say that she did not know why she did not return it after she left MCZ and thought maybe she was going to do a paper on it, or something else, but she did not remember. Either way, it was great that she went through her stuff and found this piece. She mailed the fossil out to me on Friday and I received it this evening. I have not let Bob know, as I want to drive to his house and show it to him and then let him know what it is. She also included a nice letter that I will present to him. I advised her that I will send her a picture of Bob holding the fossil. I know what many people are thinking, why did he not check on the fossil before? All I can say is that is how Bob is, he loaned it and just figured it was lost, although it always bothered him. In addition, he does not have a computer and since I had the receipt and letter, something that I did not know he had in the past, I decided to play detective. If I had known about the letter and receipt, I would have handled this decades ago. Now for pictures of the fossil. This piece was not freeze/thawed by Bob, as most of his fossils were. Looking at it, I can tell that he found it opened in the field. One side has great detail, if he had found it when it first opened, it would have been outstanding. Still this is a great looking piece, and in my opinion, large for an insect. If anyone has an ID, pass it on please. As stated above the woman who borrowed it listed it as “Spaniodera”. I am wondering if it is from the family Geraridae?
  25. I officially got notice that my Belotelsonid and trace fossil cf. Protovirgularia dichotoma were accepted into collections at the Indiana State Museum!
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