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Found 7 results

  1. From FB Trilobites courtesy of Gilberto Juárez Huarachi. Asaphidae indet., preserved in septaria, Floian of Bolivia:
  2. I saw these beauties on a popular auction site a few days ago. They are described as authentic dinosaur eggs. Clearly, they are anything but, and they appear to be simple septarian nodules. Anybody interested in how to determine whether a dinosaur egg is fake or not should do a forum search, since the subject has been comprehensively covered. This first one, you'll be fascinated to know, actually shows the preserved embryo. They have a couple of hundred watchers, and are already at a remarkable price for ordinary rocks. I informed the seller that they were not dinosaur eggs, in the interest of giving them the benefit of the doubt. They thanked me, but a day later they are still online, so I know what I think about that.
  3. Stone/Rock with Natural writing ID

    Hello everyone, I'm a collector of all sorts of things, I use to love hunting for shells and fossils near the ocean as a kid. I was going through my old collection and I found this interesting rock that I hope someone can help me ID. The specimen was found on a beach on an Island in Greece over 20+ years ago. It's got some naturally occurring shapes and letters, almost like an abstract painting on the one side and a signature on the other side. Nothing has been done to it, as found. My guesses......ancient ball of clay with some sort of plant life in it? Septarian Nodule? A little stumped so hoping someone can help out.
  4. BIO-logic or GEO-logic?

    Found this on a desert walk southwest of Tucson, Az. Cool find.....is it possibly some kind of fossil, perhaps a fossilized structure similar to septarian formations, or just a cool looking little rock? Thanks for any and all help.
  5. Septarian nodules sometimes are misidentified as turtles, coprolites and other fossils. Septarian nodules are hardened mudballs that dehydrate, crack and fill with minerals. The cracks in this one filled with fluorescent calcite. The ribs that stick out are the calcite that filled the cracks in the mudball. This nodule was found in calcareous shale from the Late Cretaceous Arcadia Park Formation. The exact age of its formation is unknown but probably occured in the Late Cretaceous. Septarian nodules from the Arcadia Park Formation are common in north Texas. Some contain spectacular calcite crystals when cracked open.
  6. Michigan Fossil Question

    I find a lot of these Michigan Lightning Stone (septarian/concretions) here locally. Often times there is a visible line, where one part is the clay part and the bottom (i'm guessing) is this material that has tubes and odd shapes. Sometimes fossil is clearly visible like the worm looking one below (2nd pic). Can anyone tell me more about these types of stones? I'm very interested in their formation but have been unable to find much information. The top pic shows the darker clay on top and the line where it appears to be fossil. The material is still clay like but has a lot going on. It looks similar to the crinoidal limestone death floor stone I find, but without the obvious fossils.
  7. Fossil Turtle

    Gotcha! But seriously, this is one of the nicest "turtle shell" septarian nodules I have found. It's from the Mississippian of Kentucky. It's 5" across (13 cm). I think it's being eaten by a starfish.
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