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Found 135 results

  1. I've gone through the galleries (some of, anyway) of Mazon Creek flora, and have a question on two concretions in my possession. Specimen # 1 resembles]pictures of Lepidostrobus, but I am uncertain.I could not find a photo of anything exactly like specimen #2, but it resembles a Neuropteris leaf with a round object at one end. Is it just another small leaflet?
  2. Which one would you choose? Please help
  3. Stromatolites?

    Hi guys, When I look online, I see mostly photos of fossil with solid cross sections, with all of the banding, or else the living stromatolite examples in Australia. However there was one publication through the University of Wisconsin extension by Neme and Bemis (2002) that has a rendering of a stromatolite that looks similar to this one which I found at Mazon in the South Unit: Do you think this is one? Next, I found these two specimen in the same gully on Easter Day, in Richland County, Wisconsin. There is a similar fossil in the member collections... http://www.thefossilforum.com/index.php?/gallery/image/8447-cryptozoon-rosmontensis/ Right next to that, I found this large laminated-looking, hollow rock thing. Is it possible that this is a stromatolite that has not been recrystalized? Can stromatolites be hollow? Thanks very much for looking, Jann
  4. I'm concerned that I'll ruin these if I continue to freeze and thaw on these two nodules, but I thought I should ask a Mazon expert regarding this. We dug these up in the fossil campground near Braidwood where we stayed on the April Fools' Day Mazon trip. There are ten concretions that came from the same matrix, close together in a small volume. The first one that split open for me this morning, fell into six pieces. Another one split unevenly, on the far left: Then the outer layer of two more nodules started to come off, and revealed parts of flora sticking out of the nodule as shown in the first two photos. Can I continue to freeze/thaw these unopened nodules, or should I try some other method at this point since there is something revealed? I appreciate any guidance and advice you can give, and thanks for reading. Jann
  5. P1030374edit

    From the album Collection

    Belotelson magister (Shrimp Molt)
  6. Hi all, A couple of months ago, I acquired a small box of unopened Mazon Creek nodules via the forum. After reading whatever I could find on the freeze-thaw method (too many TFF topics to cite here), I started doing the following. First, I submerged the nodules in water (in 6 cm deep trays, fully submerging the nodules, which were placed next to each other, not stacking them) for one week (I was on vacation). Subsequently, I put the trays in freezer until frozen solid (1 day). I repeated these steps (duration 1 day each) until nodules popped open/could be opened by hand. Most of my nodules have opened by now (two to go still) and this is what I found: Some of the nodules seem to contain bits (e.g. the ones on lower right - any ID suggestions?), but most are empty, at least to my untrained eye (have zero previous experience with Mazon Creek material). I've read the "content" of the nodules varies from site to site, and general estimates range from 1/4 to 1/10 nodules yielding something fossiliferous. However, most others who obtained nodules from the same source reported nice finds in their batches. Given this, I was wondering whether I did something wrong method-wise. Also, is it worthwhile to re-split nodules, i.e. put them back in the freezer and try splitting them along a parallel plane? P.S. During the freeze-thaw cycling, many of the nodules started to "peel"; the outer parts started to disintegrate in somewhat onion-like fashion. Is this normal? Thanks for your input, Tim
  7. Now that I found my first mazon shrimp, I've been starting to learn a little about these non-decapod shrimp-like crustaceans. Looking to learn more. Like how many legs did they have and how do they relate to modern shrimp. Post any info or pics of your Mazon shrimp finds and other paleozoic shrimplike crustaceans. Here's mine a bit cleaned up from the other day. Jack Wittry told me Friday night that he thought it was a peachocaris strongi.
  8. Freeze/thaw Problems...

    Hi everyone! SO... I placed my concretions in water for 3 days, and then froze them. I left them in the freezer for 1 week. I then proceeded to pull them out and give them like 5 or six taps each (W/ a metal hammer and the other part of the rock on concrete). But the fossils seemed 'soft' when I hit them, just rubbing material off on the ground.... I so far, haven't even been able to open one of my concretions am I doing something wrong?? -Pecopteris
  9. Mazon Fossil ll

    Here is another 3D fossil in a Mazon nodule. I am intrigued by the squared-off "stem." Does anyone know what it is?
  10. Mazon Fossil

    Here is a fossil that I believe to be a pair of Annularia whorls. It was a small nodule. Grid is 1", bold to bold. The nodule resisted repeated efforts at freeze/thaw opening. Finally the "whack and hope" method was employed. It is very 3D on one half, while its counterpart displays a more typical impression. Is there another interpretation or a more precise one, as to the ID? Has anyone had experience with "3D" preservation in the Mazon nodules? Thanks
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