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Found 8 results

  1. Adam's Cambrian

    A rangeomorph holdfast trace fossil from the Ediacara formation, Rawnsley quartzite of the Flinders Range, South Australia. This specimen is Medusina mawsoni, so called because it was until recently thought to be a jellyfish, but is now believed to be the attachment point of a fractal rangeomorph as Charniodiscus is the point of anchorage for Charnia sp. This one may have been the holdfast point for some species of Rangea. The diameter of the outer circle is 1.5 cm and the fossil is estimated to be 555 million years old.
  2. Crinoid ? Holdfast ?

    The symmetry in this little feature really is amazing to me. Its about 8mm dia. I'll go out on the limb and guess that it is the mold of a small crinoid holdfast. (its a very slender, shaky limb though) Do you recognize it ? Thanks again
  3. Ordovician mystery piece. Help, please

    Found this piece in Iowa yesterday while hunting trilobites. I've never seen anything like it. The six point symmetry with it's bulbous tips are very strange. And the fact that it is very water-worn doesn't help with an ID. I'm thinking holdfast or possibe starfish. What do you guys see? Scale in mm/cm
  4. Crinoid Holdfast

    From the album Other Fossils

    Another holdfast from the Maquoketa formation.
  5. Crinoid Holdfast

    From the album Other Fossils

    This is a crinoid holdfast attached to a cephalopod. There are a couple more smaller ones to the upper right of the large one.
  6. Crinoid Holdfast

    From the album Other Fossils

    These are multiple crinoid holdfasts on what was once a cephalopod.
  7. Crinoid Holdfast

    From the album Other Fossils

    This is a crinoid holdfast from the Prosser member of the Galena formation of Southeast Minnesota.
  8. Crinoid Holdfast

    From the album Other Fossils

    This is a crinoid holdfast from the Galena Group of Southeast Minnesota.
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