EONS: A576 HUGE POLISHED SLICED AMMONITE, 8.5" -- 1¢
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EONS: A576 HUGE POLISHED SLICED AMMONITE, 8.5" -- 1¢ OPEN DESCRIPTION: In comparison to Grade A ammonites, Grade B ammonites usually (but not always) have more variable coloring and/or minor cosmetic imperfections and/or missing chamber lines and/or more gray chambers (which is ancient seafloor sediment) and/or rougher exteriors. But for a large segment of folks, this makes them more desirable than the Grade A ammonites which tend to be single colored. Like my Grade A ammonites, this one was chipped out of the entombing rock, the fossilized barnacles removed, the outside then laboriously buffed, then it was sliced in half and polished by hand to a glossy finish. This gives us an inside look at the individual growth chambers and the story behind them: as the animal grew, it would extend the open end of the shell by adding a larger growth chamber, pull its body forward into the new chamber, and then seal the old one -- but not before evacuating the water from its old chamber. Thus, each time the shell got bigger by one chamber, the newly sealed chamber maintained neutral buoyancy. Unlike a fish, the ammonite had neither lateral fins nor an air bladder, so it needed the air-filled chambers to keep it from sinking to the bottom. Eventually though, when the animal died, it did sink to the bottom w it was covered by sediment which became
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