This jaw is built for grinding grass — and the teeth prove it, one after another, still in their sockets. Bison are grass-eaters, and grass is one of the toughest foods in nature: tough, gritty, and endlessly abrasive. So a bison grew something most animals never needed — high-crowned grinding teeth that kept growing throughout its life, wearing down year after year against the silica in the grass. The folded, wrinkled crowns you can see here are exactly that adaptation, preserved in fossil. This is a genuine fossilised bison mandible, 40 × 19 cm: A full lower jaw, heavy and complete, its deep brown surface weathered by millions of years in the ground. A series of high-crowned molar teeth, dark and stained with mineral, each crown showing the characteristic folded enamel ridges of a grazing herbivore. The solid, powerful bone — the anchor for the chewing muscles that processed a lifetime of grassland. Natural surface character — cracks and texture across the bone, honest traces of its long burial, clearly visible in the photos. The specimen is mounted on a display stand, ready for a shelf, a desk, or a museum-style cabinet. It weighs 0.93 kg — solid, heavy, real. Bison were among the great survivors of the Ice Age — their herds once roamed the northern grasslands alongside woolly mammoths — and fossil jaws like this one are the quiet records of that vanished world. Honest note: the jaw is identified as bison by its overall form; we show both sides and close-ups of the teeth, so you can judge the condition exactly as it is. Whether you collect vertebrate fossils, teach natural history, or simply love the deep time written into bone — this bison mandible is a genuine, untouched fossil, ready to be displayed. Specifications: Type: Fossilised bison mandible (lower jaw) Reference: 070 Size: 40 × 19 cm Weight: 0.93 kg Features: High-crowned molar teeth with folded enamel crowns, natural surface weathering Species: Bison (large grazing mammal) Stand: Display stand included Condition: Natural fossil, weathered as shown in photos Age: Fossil (geological age not specified) Origin: Natural specimen, not artificially treated It is a jaw built for a lifetime of grass, fossilised and standing on your shelf. You get to display it.