Dendraster Gibbsii - Fossilized Sand Dollar - 1.166"Fossilized at the bottom of the sea floor over 5,000,000 years ago, this Dendraster is a window into the ocean's past. The body plan of the animal has been preserved in beautiful detail, with their intricate skeletons still clearly visible. This particular fossil is a 1. 166" Dendraster gibbsii from the San Joaquin Valley deposit. The petroleum in this region provides a unique, natural stain to the item.