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Found 3 results

  1. Found in the side of a building and in the surrounding landscaping. From the Cambrian seashore sandstone of Blackberry Hill Wisconsin. The place is known for its fossils of mass jellyfish strandings and its trace fossils of some of the first arthropods, mollusks, and other animals on land. What are these? Thanks!
  2. I’m very curious about these “ripple marks” that I have seen posted a few times on the forum. From what little research I have been able to do (so far...) they seem to be caused by wind or water erosion of the rock. However, there is mention of them possibly being fossilized rippled sediment from the floor of a body of water. So... are these geological erosions or some type of fossilized evidence of water movement? I can see how the erosion would work, but wouldn’t the sediment be compressed during lithification/fossilization and destroy the details if it was from a body of water millions of years old? Ripple Marks Mention of Fossilization
  3. Nimravis

    Jurassic Ripple Marks??

    I have had these and others in my collection for about 27 years, most of them have been wrapped up or still are wrapped up since I collected them with my son. I always classified them as Ripple Marks, but wonder if they are, we collected them a little to the West of Sundance, Wyoming in exposure that is supposed to be from the Upper Jurassic / Morrison Formation. What is your opinion?? Top of Plate Bottom of Plate
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