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  1. Jbenton

    Illinois tooth ID needed

    Hi I don’t believe this is yet fossilized, but need your help on an ID. From far northeast Illinois. Any idea?
  2. connorp

    Mazon Creek Rhacophyllum

    Here are two interesting Mazon Creek flora nodules that popped yesterday. I believe they are both assigned to Rhacophyllum. If so, I am excited, I have not come across this "genus" before. Rhacophyllum cornutum Rhacophyllum fucoideum I am pretty confident on the IDs but confirmation is always great. I am quite interested however in the second specimen. It appears that there is a root-like structure emanating from the central base. I cannot find many images of R. fucoideum online so I am not sure if this is significant or not. As usual, any though
  3. I thought I jump on the bandwagon of Mazon Creek and show my little collection. I’ve been picking up the odd fossil here and there to add to my allotment. This has been over the last 5 years. Originally I was introduced to the ironstone concretions by Ralph in one of his great auctions to support TFF, which I was lucky enough to win. The first 3 added after the collection photographed in the drawer, I could do with a little help for identification please. 1: sea cucumber, 2: worm, 3: Has a label but it is only the seller’s info ? thank you help and for looking.
  4. Hey all, I'm hoping that one of you has access to a page that's missing from the online pdf version of USGS Professional Paper 203: James Williams' 1943 STRATIGRAPHY AND FAUNA OF THE LOUISIANA LIMESTONE OF MISSOURI. The missing page is Plate 9. I have everything else, so if you happen to have access to a hardcopy version, just scan the plate and post it here, thanks so much!
  5. I_gotta_rock

    Our Great I-80 Road Trip

    Greetings, all! After exploring outcrops and spoils piles from Quebec down to Florida, we are heading west from Delaware to Crawford, Nebraska and back this fall. Planning to stop by Sylvania, OH and Clear Lake, IA. Probably Richmond, IN. Any other suggestions? Thoughts on these three?
  6. I've been super excited for this book to be released since I heard about it last year. The diversity in the Platteville is astounding, but there are not a huge number of publications on its fauna, and most without pretty pictures. I just ordered my copy. Dennis Kolata is the Platteville expert, so I have no doubt this will be a phenomenal book. https://isgs.illinois.edu/achievements/august/fossils-upper-ordovician-platteville-formation-upper-midwest-usa-overview
  7. This concretion opened today. I cannot decide if it a poorly preserved syncarid or more hopefully a partial centipede (Mazoscolopendra?). Any thoughts? @RCFossils @Nimravis @flipper559 @bigred97
  8. 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 Tullimo
  9. Hi all, this strange piece came with a batch of edestus fossils that were found in a coal mine in Illinois. Have no idea what it could be, the front seems to be coated in black coal mostly while the back has what appears to be ridges. All I know about the location is it was found in a coal mine along with some edestus teeth that is Carboniferous in age. Hoping with some help to get to the bottom of this mystery.
  10. connorp

    Mazon Creek Find - Millipede?

    I am somewhat hopeful that this is an example of Amynilyspes (a pill millipede), but would like to get another opinion. It was found open and is a bit worn. @Nimravis @bigred97 @flipper559 A close up of the "tergites"
  11. Perfectly preserved 310-million-year-old fossilized brain found By Harry Baker, Live Science, July 28, 2021 Bicknell, R.D., Ortega-Hernández, J., Edgecombe, G.D., Gaines, R.R. and Paterson, J.R., 2021. Central nervous system of a 310-my-old horseshoe crab: Expanding the taphonomic window for nervous system preservation. Geology. Open access Yours, Paul H.
  12. This weekend I was able to spend a couple hours breaking rock at one of my favorite Pennsylvanian sites. This site exposes the lowest units of the Carbondale Formation, from the top down: Mecca Quarry Shale (MQS), Francis Creek Shale, Colchester No. 2 Coal, paleosol. At various times both the St. Peter Sandstone and Platteville Group (both Ordovician) have been exposed at the bottom of the pits (they were not visible this trip), representing a major unconformity in the area. The concretions from the Francis Creek Shale (i.e. Mazon Creek fossils) are not productive here - my area of focus was i
  13. Hi all. I posted about a week ago in this forum with what I thought was a Maclurites fossil I found in the Galena Group in Illinois: http://www.thefossilforum.com/index.php?/topic/116602-ordovician-maclurites/. Others agreed with me. There are two parts of this fossil that I wonder about. One is fairly large and may be a piece where the outer shell of the Maclurites broke to reveal an inner layer. It may also be a second specimen that was fossilized along with the Maclurites, replacing part of it. (I bet there's a term for that, but I don't know it!) This part of the specimen stands out by vir
  14. This weekend I had the opportunity to spend a couple hours hunting in the Galena Group (Upper Ordovician) in northern Illinois. The Galena around here is mostly massive dolomite, so most fossils are preserved as molds. Mollusks dominate the fauna, especially gastropods, although other interesting specimens crop up from time to time. Burrows A large orthoconic nautiloid Fisherites are fairly common in some beds, although extracting complete specimens is challenging. Thaleops sp. Some better gastropod examples
  15. Hello everyone! I recently purchased two fossils, they were both sold to me as Ordovician the crinoid being from Wisconsin and the brachiopod from Illinois. @connorp has told me in a different thread that the dolomites of the region also preserve Silurian fossils and that these look much more like that. Doing a quick Google search I did find something that looks very similar to the crinoid I have, but I don't know enough about these animals or the area they come from to be certain of the ID. Here is the crinoid in question: To me this calyx looked quite similar t
  16. connorp

    Tiny Pennsylvanian Ammonoids

    Over the past year I've I found two tiny ammonoids from a site in the Carbondale Formation (Middle Pennsylvanian) of Illinois. Both measure approximately 5mm in diameter. The first specimen below showed no details of the exterior of the shell, which I believe are necessary in identifying these. This week I found a second specimen (maybe a different species) which does show the suture pattern. I'm hoping that this specimen is identifiable. Part Counterpart Does anyone recognize the species? Thanks!
  17. NWARockhound

    Guides for IDing Illinois Glacial Till?

    Hello, I have found a good number of marine fossils in an Illinois river near Champaign which was created by glacial runoff. I was wondering if there was any sort of guide or useful papers for identifying them anyone would recommend, especially since very similar fossils seem to occur throughout the Midwest in other areas that had glaciers. I'm not so curious about these specimens specifically, just thought it might be nice to post some pictures, although I don't know what the middle one is. A bryozoan? I would just like to learn a bit more information in general. Thanks!
  18. treebarkjerry

    Southern Illinois petrified wood

    Out collecting some chert in Union County Illinois and came across two chunks of what I think are petrified wood. The small piece in the first two photos shows good wood grain, and an odd black chert or almost coal looking layer around the outside. The larger piece doesn't seem to show much grain...notched a corner off on a tile saw but the cut is so rough it's hard to see what the grain looks like. Both have an odd flattened cross-section seen in the photos. The 'bark' is odd to me too - thought it might be fossilized bone at first but don't think so anymore. Anyone else that
  19. Last year @jdp was kind enough to identify the tiny and jumbled skeleton I found in a concretion in eastern Illinois http://www.thefossilforum.com/index.php?/topic/107472-mysterious-jumble-inside-pennsylvanian-concretion/ as a lysorophian tetrapod and direct me to the Field Museum in Chicago as a possible repository for it. This month I finally completed the donation and it has been added to their collection, a fantastic event for someone who has been visiting the museum for more than 30 years to gaze in wonder at their world-class collection. Thank you again to @jdp and The Fossil Forum for m
  20. I had contacted someone to register myself regarding a private hunt in a creek. They serve a picnic afterwards. I was to receive verification a month ago and none has come. Does anyone know how to contact the couple offering this? I have lost their information. Mike
  21. 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 luc
  22. Last summer I posted a trip report about finding some Pennsylvanian black shale in a river bed in East Central Illinois http://www.thefossilforum.com/index.php?/topic/106753-628-illinois-black-shale-trip-w-listracanthus/. I was able to visit the site again once more in the fall last year when the river was running much lower and collect more and larger pieces of the finely bedded and fissile shale. Since then I have been slowly splitting and going through the rocks I brought home, and finding many interesting fish parts- that is definitely the dominant fauna presen
  23. 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 on
  24. With the nicer weather last week, I was able to make two brief trips to kick of the year. There still ended up being a lot of snow on the ground, but it was manageable. My first trip was to one of my favorite sites, a roadcut in the Pennsylvanian LaSalle Limestone in Illinois. Lots of the usual stuff was found, but the two trip makers were a small Peripristis shark tooth and a Linoproductus mass mortality plate. Here's the tooth. I think it will clean up nicely. And here are the Linoproductus. There's around 50 individuals present, and they are all quite small com
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