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Found 12 results

  1. I have come across, for sale, a pyritized agnostid trilobite from the Wheeler Shale. I was curious if anyone had seen these before, and if so, how susceptible were they to pyrite disease? It's quite a nice specimen but I don't want to waste money if it's guaranteed to rot in a year or two.
  2. three from the house range

    As promised (quite a while ago, I'm sorry!) Here are photos and prep notes Start - scope is a low power model, x10 and x30. I do most of my work on x30. The needles I scrape with are in pin vises, available at most hobby stores and online. I find sewing machine needles are thicker and stronger, and work well. I do sharpen them with my wet stone when they get dull! (Be careful, it is very easy to have adjusted to using a dull needle for the past hour, sharpen it up nicely, and then press to hard, damaging the fossil!) The tuna can is for rock dust and pieces, they go to the compost pile. I heat the fossils on low heat for 5 minutes. I try to get them just hot enough that I can still touch them. I think this drives out the water, but I know from experience that it makes the fossils harder and stronger. At least in Wheeler shale. I do this at the start, every time I wash the fossils, and if I take a break longer than a week. The next step is to flip the fossil over and use my utility knife to scrap/grind off any high spots on the back. It is important that the fossil not rock back and forth while I am working on it. 1 - This is looking like a Brachyaspidion microps, Swazey Springs is thick with them! Despite the nice shield of matrix that covered the trilobite the spine at the top rear of the Cephalon has been lost. Oh well. The rest of the fossil looks to be in nice shape. I am leaving the matrix on the axial rings for last as it protects the small spines that sometimes are there. It will be the last part I clean for that reason. Note the "good" and "bad" pictures. It is always best to work with the needle pointing away from the fossil. Sometimes this is not possible, but I try to do as much work "away" as I can. I try to clean the whole fossil a little each pass, rather then trying to clean one area completely. If you are wondering what the half circle is on prep 1, I mark all my finds in the field with a circle around the fossil and an "x" on the back. It makes them much easier to find if I drop one or forget exactly where I set it down! 2 - While clearly an Agnostid trilobite I am not yet ready to id it in any way. I did not realize it till I started working but the shell has exfoliated on the parts that are exposed. Normally I would work a few areas hard to id the fossil, and toss it (OK, mostly likely it would go into a box I donate to a local school), but as I started on this little project I will finish it. 3 - It was just too weathered! I broke this one in half after about 5 minutes of work. I tried to glue it back together, but that did not work. All told I put about 30 minutes into each of the fossils that survived. I see from the picture I need to do a little more work on the Brachy!
  3. Pre/Cambrian Collection

    I have always been quite fascinated with the early stages of development of life on Earth. My interest really picked up when I first discovered the Ediacaran biota, and who can blame me. Those creatures are so enigmatic and fascinating. I was able to pick up a few specimens, but quickly realized that my desire for fossils greatly outweighed the supply and cost of Ediacaran fossils, and I soon discovered the equally fascinating and enigmatic Lower Cambrian Chengjiang biota. I was, and still am, blown away at the quality of preservation of these soft bodied critters. A lot of specimens come very shoddily or incompletely prepared, and while it's been a steep learning curve, I feel that I'm starting to get the hang of prepping them. I've decided to start posting my latest acquisitions as these fossils are too amazing not to share. First up is Cricocosmia jinningensis, a fairly common palaeoscolecid worm from the Chengjiang biota. I have several specimens but this one is the best. It came partially prepped and I am just now satisfied with the result. You can see remnants of the gut preserved as darker regions in the center of the body. Next up is a small hash plate of Bohemiella romingeri brachiopods from the Middle Cambrian of the Czech Republic. Not my usual purchase, but I felt the specimen was too beautiful to pass up.
  4. Itagnostus interstricta

    From the album Trilobites

    Wheeler Formation Millard County Utah, United States

    © 2018 by Jay A. Wollin

  5. Bolaspidellus housensis

    From the album Trilobites

    Wheeler Formation Millard County Utah, United States

    © 2018 by Jay A. Wollin

  6. Elrathia kingi

    From the album Trilobites

    Wheeler Formation Millard County Utah, United States

    © 2018 by Jay A. Wollin

  7. Does anyone know where I can get, either pdf or paper, copies of Robinson's detailed descriptions of the Marjum and/or Wheeler formations (House Range, Utah)? Thanks
  8. Itagnostus interstricta

    From the album Trilobites

    Taxonomy: Itagnostus interstricta Age: Mid-Cambrioan Location: Utah, Wheeler Fm Source: Gift (collected by J. Rice)
  9. I have been researching a fossil "Anomalocaris sp" from the Wheeler Shale. Its from a collector who thought it was his "worst" Anomalocaris fossil and he was clearing his collection to make room for more. I collect Anomalocaridids so bought it from him for less than a $100. I thought the feeding appendage was a little strange as it was so straight, the spines were strange and small, and I couldn't see the podomeres (segments). I love the papers from Dr Allison Daley of Oxford who is an expert on Anomalocaridids and in a paper "New Anomalocaridid appendages from the Burgess Shale, Canada", (A.C. Daley & G.E. Budd, Palaeontology vol53, part 4, pp 721-738, 2009) I read about a very rare and enigmatic Anomalocaridid, the Caryosyntrips serratus. Only 11 or so specimens of this critter have been found and all at Burgess. I realized I was looking at my "anomalous" Wheeler Shale Anomalocaris. But how can this be? The Caryosyntrips has never been found outside of Burgess. Wheeler is also substantially younger. I was sufficiently convinced that I sent an email to Dr Allison Daley and she responded quite fast. She's very excited about this fossil! She also believes it to be a Caryosyntrips serratus and couldn't believe I have one from Wheeler Shale! The greatly increases the temporal and geographic range of this genus and is very important to study. She is writing a new paper on the Anomalocaridids of the US and this is a massive new discovery which will feature in her paper. Of course, I am sending her the fossil to study. After that she recommends I donate it to the Museum of my choice, and suggested the Smithsonian as they already have a large Wheeler Shale collection. Being an Aussie, I'd love it to end up at an Aussie museum, but this Caryosyntrips was "born in the USA" so I believe that's where it belongs. So the Smithsonian it is. Great lesson to everyone on researching your fossils! Sometimes a seemingly impossible fossil can actually be a new discovery. And communicate with the experts, this fossil could have ended up in a private collection as a "low quality Anomalocaris sp." Finally, I could sell this for a huge price to a private collector, but its much better off being studied and residing in a Museum. That's where it belongs. On Monday I will send the fossil off to Oxford for Dr Daley to study. Can't wait to read her new paper!
  10. Anomalocaris from Wheeler Shale

    From the album Anomalocaris and friends.

    Grasper from an Anomalocaris sp. (not yet classified) from the Middle Cambrian Wheeler Shale of Utah. The biggest predator of its day!
  11. Hello, I have read conflicting reports/labels on this and I am still unsure. Are the red beds (fine red shale) about a half mile due south of U-Dig quarry, in Wheeler Amphitheater, Wheeler or Marjum formation? The exposure is quite thick, but lacks the 10 to 15 foot thick limestone layer that occurs about 2/3's up in the typical Wheeler formation. I have been told the Marjum also has a "red bed", do you think that just refers to the red rock up by the old Hemirhodon quarry (and all along the Marjum pass cliffs)? thanks, Trilobite Tim
  12. Here a specimen of "Acrothele subsidua?" a brachiopod from the Cambrian Wheeler Shale in the House mountain range of Utah. A Cambrian specimen of something other than a trilobite.
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