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Tractor Ammonite: polished ammonite fossil belonging to the genus Douvilleiceras, which features a distinctive, heavily textured shell with pronounced, bumpy ridges or ribs often referred to as a "tractor" or "goat horn" pattern. This marine mollusk dates back to the Early Cretaceous Period, making it approximately 100 to 112 million years old. While these prehistoric cephalopods were distributed worldwide, highly polished specimens with this specific rich, honey-brown agate mineralization are famously sourced from Madagascar.