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Oxytropidoceras posted a topic in Fossil NewsThe 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: https://www.researchgate.net/publication/283578095_The_Impact_Response_of_Coquina_Unlocking_the_Mystery_Behind_the_Endurance_of_the_Oldest_Fort_in_the_United_States https://www.researchgate.net/profile/Phillip_Jannotti Yours, Paul H.
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, Matthew carved into the Pleistocene shelf on which the islands rest and churned up chunks of shell-laden sandstone off the coast of Avon, on Hatteras Island. Some of the ancient shells are so well-preserved that I'd not recognize them as any older than a few years -most of it while they were inhabited - if not for the sandstone firmly affixed to the shells. Some were conglomerates of identifiable shells. Some are agatized. One had grown a calcite (?) crystal lattice. No empty pockets for me! I am definitely no expert. Or local. My guess was that my finds were relatively recent. Digging around with the kind help of Abyssunder, I came up with Pleistocene era. A few other goodies from the day include: an echinoid sand dollar, probably Mellita sp. Argopecten gibbous cluster and another scallop Mercanaria sp. with a small, agatized bivalve embedded on on the inside clockwise from upper left: Astrangia lineata, an unidentifiable bivalve, Solenastea bella, and Septastrea marylandica
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.