Slab showing layered zones of red, yellow, and brown, with fine cell detail preserved across the surface. This piece likely comes from the Morrison Formation, a Jurassic-age deposit in Utah that produces richly mineralized dinosaur bone. The bold colors are the result of iron and limonite infiltration, creating a natural record of groundwater chemistry that replaced the bone structure over time

52.96 grams / 80.8 x 33.5 x 7.5 mm