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Found 8 results

  1. I_gotta_rock

    Strange Preservation

    Here's a strange one. I found plentiful piles of what I thought were casts and internal molds in the iron-rich St. Mary's clay of Virginia last year. Loose clam fossils riddled blocks of talus. I was able to wiggle some out of their ancient resting places without s much as scratching the matrix. Generally that's because the shell disintegrated, leaving a void between the mold and the cast. If you look closely, however, what looks here like an internal mold isn't. The sculpture on the surface is clearly the outside of the shell. If it were the inside, you would see round protrusions where the
  2. I saw this and thought it was pretty wild as I've been poking around in the Tamiami here in Florida for quite awhile--not sure I've ever noticed one. I dont have full access to the pdf but heres the abstract and article in ScienceDaily. @MikeR Regards, Chris https://www.sciencedaily.com/releases/2019/07/190722132520.htm Cosmic pearls: Fossil clams in Florida contain evidence of ancient meteorite Date: July 22, 2019
  3. Chelydra

    fossil quahog

    This amazing bivalve fossil was a gift. The giver had no info to offer. I am curious about what its origins might be - where/when; about how old it might have been when it died (it is 6 inches across and has several hundred growth ridges); and I would like to understand how fossilization can result in what appears to be a set of perfectly intact valves, complete with so much detail - in other words, the shells are much heavier than living shells would be, what has replaced the calcium bicarbonate to make the shells so much heavier?
  4. Ludwigia

    Mercenaria permagna (Conrad 1838)

    From the album: Gastropods and Bivalves Worldwide

    10cm. A nice "Crystal clam" from the early Pleistocene at Fort Drum Crystal MIne, Fla., USA. Thanks to CBOB for the blind trade.
  5. sixgill pete

    Mercenaria corrugata

    Collected from the Rushmere Member of the Pliocene Yorktown Formation. Most of these, along with many of the other "clam" type bivalves are extremely crumbly and often fall apart when picked up. This specimen was dug out of the layer and is a great example of the species.
  6. goatinformationist

    IMG-0241.JPG and IMG-0247.JPG

    From the album: George Prince

    Beautiful dog tooth calcite spar in mercenaria permagna
  7. goatinformationist

    Mercenaria permagna

    I am currently down to about 100 specimens and will include more pictures when I pull them out of the basement for that purpose. They are heavily traded and many of the better specimens are sought after by collectors and museums. I know that they have been around the Tucson show for more than ten years. Called Mercenaria Permagna with dogtooth calcite spar inclusions. The pit is currently closed but spoil piles are still available to the collector for a fee. More information on this fossil type is available at: SEGS-Guidebook-45.pdf, (State of Florida) onlin
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