Fossils are not simply the preserved remains of long-dead creatures. They are a geological phenomenon that can appear in many unique and beautiful forms.

This specimen is one such fossil, a 2.70" polished slice of agatized sauropod bone from the Morrison Formation in Utah. One of the most studied fossil beds of the Upper Jurassic Period, the region was once home to a large floodplain ecosystem 150,000,000 years ago. Over millions of years, hard minerals, like chalcedony and quartz, replaced the original organic material. The result is a marrow matrix exhibiting incredible detail.