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Found 6 results

  1. Just as a curiosity, I thought I'd compile a list of fossil groups that are known to be so abundant in places as to be rock-forming, i.e., to form coquinas, often of a single species. I started the list but there are probably many examples I am unaware of. For example, hyoliths...? Care to add to the list? Various pelecypods (including modern/subfossil examples) Various gastropods (including modern/subfossil examples) Some rugose, tabulate, and scleractinian corals (including modern/subfossil examples) Some crinoids (as encrinite) Some ophiuroids (but r
  2. TOM BUCKLEY

    COQUINA

    Has anyone ever found anything more substantial in coquina than shells? Hailing from Upstate New York, I'm used to using my muscle and splitting bedrock. Sadly, in Florida where I now live, there is no bedrock, but there is lots of coquina. Should I bother attacking these blocks? Is there any chance of a saber tooth skull being in the middle? I just want to break some rocks. Tom
  3. The Mystery of Florida’s Cannonball-Eating Spanish Fort The secret is inside the walls themselves. By Lina Zeldovich Atlas Obscura, July 4, 2019 https://www.atlasobscura.com/articles/coquina-fort-in-florida A paper is: Subhash, S.G., Jannotti, P. and Subhash, G., 2015. The Impact Response of Coquina: Unlocking the Mystery Behind the Endurance of the Oldest Fort in the United States. Journal of Dynamic Behavior of Materials, 1(4), pp.397-408. https://link.springer.com/article/10.1007/s40870-015-0035-1 PDF file at: ht
  4. Ancient Bones

    small shells

    I have some small rock samples similar to this. What is the best way to extract some of the shells? Is vinegar safe ? I believe the matrix is coquina.
  5. I_gotta_rock

    OBX: Surprise, Surprise!

    Last week, we went out to the Outer Banks of North Carolina for some wind-and-water sports. Only one problem: no wind. So, we combed the beach most days. It'd been a week since Hurricane Matthew tore through the Caribbean and Southern US. The Outer Banks are not generally considered a hot spot for fossils, though seekers of modern shells love the place. When we went out, I told myself I had enough modern seas shells. I wasn't taking anything home unless it was at least 10,000 years old. That should be enough self-restraint to send me home with empty pockets. As luck would have it
  6. kerouac22

    Bioherm? Coquina?

    Hi all, Found this in a creek bed, which I think is Mississippian. Anyway, it appears to be a conglomerate of a bunch of tiny crinoid pieces. Little specks come off of it just when I lift it up. I split it in two to see if it went all the way through, which it does (maybe a dumb idea, I later realized). The only words I can find that come close to describing this are "bioherm" and "coquina," although neither of those really hits it on the head. Anyway, I'm assuming it's a fossil of some kind? Thanks for your help.
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