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  1. I live in Chicago and for a while I’ve been wanting to try Fossil Hunting in Mazon Creek. My first trip three weekends ago I tried to have myself prepared but still wasn’t quite sure what I was getting myself into. I hiked to the tipple area, there I had a really hard time telling rocks from concretions because especially in that area most of the rocks are covered in an orange rust. I collected 5 gallons of what I later realized were almost exclusively rocks. The trip was still worth it though because there were lots of these fast little lizards running around on top of the exposed coal, a
  2. Last Sunday I took the day to scout some former coal-mined land in western Indiana as well as revisit some sites I hadn’t been to in a few years. The mines at these sites were working the Springfield, Hymera, and Danville coals at various points in the mid-late 20th century. The land has been reclaimed to varying degrees, but I hoped that typical Mazon Creek-like fossil-bearing concretions could still be found, despite almost no information in the literature. Temperatures were a little chilly with the wind blowing as I arrived at the first site. There to greet me was a he
  3. This is a statement that I often make to myself throughout the Summer and the vast majority of the time I decide to stay home. This was not the case in decades past and it is not because I am older and slowing down, which is definitely not the case, the main culprit is vegetation. Today I had the idea of going to the Pit and taking pictures of the area so new collectors can see areas that they collect at and also see the conditions that they will face in the summertime. I usually go to the Pit at the beginning of the fossil collecting season (March 1st), this is your best chance to
  4. Ive decided to start a crab prep thread instead of doing a post for every single crab I prep. If it works, great. If not, then I will go back to seperate posts for each. I will start with this one that I just started today. This is Pulalius vulgaris from the state of Washington and Eocene in age. This was 'Whacked' open by my youngest son. Turned out to be a purty good whack. This first picture is with the top piece of rock tossed away and the 2 pieces you see on the side are pieces from the bottom of the rock. You can easily see how the crab is not situated correctly in the rock.
  5. Peat Burns

    Pennsylvanian fern concretion

    Hi, This is an historic specimen collected in the 1870s or 1880s. Unfortunately, it has no provenance. I suspect it might be from northern Illinois or Southern Indiana. Any help on ID would be much appreciated. I was thinking along the lines of Lobatopteris or Pecopteris strongii?
  6. Howdy all, Any Houston area members interested in trying your prep skills on Mississippian black shale concretions from Fayetteville, AR? I collected too many last year and I’d like to give them away rather than see them collect dust in my garage, or worse, rot outdoors. These concretions are mostly made up of siderite and contain pyritized marine fossils. I dug these out of the lower unit shale and they’ve had limited exposure to moisture and have been stored indoors for months. If interested I’ll mark the exact spot I collected them. This specific unit and location i
  7. In November 2018 I found a site in the Middle Cenomanian Tarrant Formation. Parts of the site were in the Lewisville member of the Woodbine. In the Lewisville I only found a few common bivalves, but the Tarrant produced multiple large concretions packed with ammonites, plant material, fish bones, and some unknowns. Some of the largest concretions were about 2 meters by 2 meters by 2/3 meter thick. But of course sizes and shapes varied. The concretions were a bit crunchy on their weathered exteriors, but in their blue interior they were harder than concrete. Lots of weathered ammonites covering
  8. I didn't get out hunting much last year, still working on figuring out how to research and find spots, but a friend of mine invited me out to do some collecting at one of his spots up in Washington State. I took some family with me and we went out over the Winter break in mid December. Pretty cold but beautiful! We're mainly looking for concretions weathered out of the formation, but occasionally you find Callianopsis claws loose in the formation, usually very brittle and in poor condition. Lots of mollusks to be found as well as crustacean
  9. Great open access paper about the Devonian Gogo Formation Lagerstätte, Canning Basin, West Australia. Trinajstic, K., Briggs, D.E. and Long, J.A., 2021. The Gogo Formation Lagerstätte: a view of Australia's first great barrier reef. Journal of the Geological Society. Yours, Paul H.
  10. ProfMarvel

    Concretion or Fossil Egg

    I found about thirty of these specimens partially eroded out and partially buried approximately 100-200 ft above the Owyhee River in the Upper Great Basin Desert of Eastern Oregon. I would appreciate any identification suggestions. Thank you
  11. Hi everybody. I remember seeing a thread about fossils coming from New Zealand and in it was a paper about legality and such. Does anyone know how I can find that? I tried the internet but all I got was confusion. any help would be much appreciated. Thank you RB
  12. I was eager to get out before the heatwave coming up so I made the visit to a couple new Cannonball sites the other day as well as property adjacent to where I collected the crabs this spring. I was expecting more good bivalve material from the first sites but I'm pretty happy with the results regardless. Sort of a continuation of this topic. I tried a few cuts before working my way down to the area I found the concretions in before. The material in all was extremely fragmented. I still need to bust that concretion. One of the inconspicuous cuts. More fragments.
  13. Hi guys, Brand new to the forum, but excited to be here. I found this in an area where water used to be very high all around me. In fact in a great deal of Thornton Co. In this case I am around the Niver trail. I am not so much the expert in geological terms so I will forego the effort in outlining this, but I will say the rocks around are very interesting. A lot of petrified wood, some form of molten rocks and evidence of extreme heat, has made for some interesting mineralization many of my finds. I look forward to your advice and have much more to show and hopefully lear
  14. Lone Hunter

    What's in this burrow?

    This came from Eagle Ford Kef creek, I have collected odd burrows but this one appears to have things in it. Anyone recognize anything? Can there be concretions inside a burrow? Pictures show wet and dry.
  15. Today I had the pleasure of attending I & M Canal Corridor Trip to collect on the "actual" Mazon Creek (River) in Morris, Illinois. I believe that this is the 11th year for this trip, which is held on Saturday and Sunday on a 400 acre farm that has access to the river. This is the first time that I have participated in this trip and thanks must go out to Rich @stats for letting me know about this trip last year. In January of this year Rich contacted me again to let me know that the sign-up for the trip was on line, so on 1-6-20 I sent my payment of $150.00 in and reserved my space. Some o
  16. Hi! I'm pretty new to the whole fossil hunting thing and in the process of trying to gather as much information as I can I might have messaged some of y'all. I was just wondering of any spots in washington to look for crab concretions. I understand wanting to keep spots private, and infact encourage it, but I've been getting stir crazy as I wait out the winter months. I've done as much research as I can online so far and have a few spots I'm thinking of scouting but would love to hear from more veteran people confirmed spots or handy tips for finding spots while out and about!
  17. jort68

    Concretion Innards

    Hello again! Hope everyone is having a fossiliferous holiday. I found this split concretion yesterday with some organic looking form peeking out from inside. Take a look: No idea. Nothing recognizable except that hole. Found this at the same site, those long and narrow shells might have been what was stuck in there? What do you think? Nothing and it's just gobs of clay?? Let me know if you have any thoughts and as usual, thank you so much for your time and consideration.
  18. Good afternoon folks. I am wondering if anyone in our group has a "collection" of mislabeled concretions. If so, post them here it may help others identify some of their unknowns.
  19. I've always been really into fossils and prehistoric stuff but I only recently starting going out and fossil hunting. On a recent trip I found 5 concretions from the lincoln creek formation in washington state. I'm pretty sure only the middle one has something in it but I'm at a complete loss at how to go about cleaning these. I dont have a air scribe and I'm completely content with just seeing some of the crab, if there is one inside any of the concretions, and would love some pointers to go about this. Also how to preserve them once they are exposed. I've seen people using some
  20. butchndad

    Can these 3 be ID’d?

    Tiny items, 1/2 - 1/4 inches, picked up in Big Brook that caught my attention and warranted being brought home. Teeth? Bivalves? Concretions? As always thank you for sharing your expertise
  21. Darbi

    Concretionary?

    From my previous trip to Ellsworth County, Kansas and it's located in Dakota formation, Cenomanian. It appeared as almost like vertebrae but I'm sure it's not verts. Is it by chance some form of ichnofossil? @jpc thinks it's concretionary. No disrespect to him, he's the only one who offered his opinion and I would like to know if anyone else have a different opinion.
  22. Yoshida, H., Ujihara, A., Minami, M., Asahara, Y., Katsuta, N., Yamamoto, K., Sirono, S.I., Maruyama, I., Nishimoto, S. and Metcalfe, R., 2015. Early post- mortem formation of carbonate concretions around tusk-shells over week-month timescales. Scientific reports, 5, no. 14123. Open access Nagoya University PDF link Researchgate PDF link More papers by Ippei Maruyama More papers by Hidekazu Yoshida Related papers are: Yoshida, H., Yamamoto, K., Minami, M., Katsuta, N., Sin-ichi, S. and Me
  23. The Basic Dinosaur Egg Guide Many people often mistake a concretion for an egg, to help clarify what is a concretion, and what is a real egg, here is a guide. A quick overview with examples: How to spot a concretion: How are they different from eggs? A concretion is a rather common rock made of tightly compressed minerals. Typically, concretions are a smooth sphere or oval with little to no surface texture or just a few bumps. Often nearly a perfect sphere, sometimes more of an oval. In a concretion, there
  24. Hello. I was just curious about what some good techniques for artificially weathering a concretion to get them open are? I've read that the best way to go is to soak, freeze, thaw, and repeat. But none of the sources I've read describes how long that takes. I'm sure it varies from specimen to specimen but is this process weeks, months or years? Does anyone have any other methods or resources about the process? I was thinking of giving it a try and could use some more information on the process. It seems kind of like the old geode gamble in a way. There's no way of knowing what's inside unless
  25. WyoOtto

    Concretions or Eggs

    Hi All, I'm new to the forum and I have no paleontology experience other than a class from undergrad 20 something years ago. My background is structural geology, hence my post here in hopes that I may confirm my suspicion as to the genesis of the specimens in the attached pictures. First a little background: I was in the field yesterday doing some reconnaissance work in east-central Wyoming. The land owners whose property I was on are multi-generational ranchers and they were extremely welcoming and enthusiastic about the geology of the area, despite having limited knowledge. At the e
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