This specimen is a fossilized sand dollar come from Pliocene Epoch deposits (c. 5,000,000 years old) in the San Joaquin Valley of Central California. It is a remnant of a time when the valley was home to an inland sea seated between the Sierra Nevada Mountains and the California Coast Ranges.

The specimen ships in a sturdy shipping carton and includes a small information card. This particular fossil is a one-of-a-kind item but you can see our other Dendraster items available for sale in the collection below.

Sand dollars are echinoderms, an ancient and broad family of animals which includes starfish, sea cucumbers, and sea urchins.

Like most echinoderms, this species, Dendraster gibbisii, exhibits a five-point radial symmetry which is reflected in the patterns on the surface of the fossil.

The coloring of these specimens is unique among sand dollar fossils due to the presence of petroleum in the San Joaquin Valley deposits which lends a natural stain to the stone.

For an in-depth look at the geology of this region, we recommend stopping by San Joaquin Valley Geology. Their introductory page provides a great overview to the history of the region.

Below are pictures of the preparation process. Each fossil is prepared by hand slowly revealing the patterns beneath the rough exterior and then finishing to a glossy shine.

Please Note: Each specimen is the fossilized remnant of a unique creature. As such, the specimens will vary in size, color, shape, pattern and coloring.