Fossils are remnants of organisms living in a past geological age. Most are preserved in fine-grained sedimentary rock such as limestone or shale. Typically the soft parts of the organism decompose quickly and the hard parts, such as shells and bones, remain in place longer. Eventually the remains gradually turn into stone. Fossilized Sand Dollar is the preserved remains of an ancient species of Sea Urchin. The Shell Fossils sold on Moonrise Crystals are a type of ancient Clam. Turritella Agates contain fossils of an ancient freshwater snail, Elimia tenera.
Petrified wood is the fossilized remains of ancient trees which flourished millions of years ago. Typically when a tree dies, it decomposes relatively quickly, leaving no trace behind. But occasionally, a tree may fall into a river or be swept away in a flood. When this happens there is a chance that the tree may be quickly covered with fine-grained sedimentary materials, such as clay or ash. As the wood decomposes, its outer structure is preserved and replaced by various silica minerals found in the sediment, including Chalcedony, and less frequently, Opal. These crystals create the rainbow of colors found in Petrified Wood. While any tree can potentially be fossilized, most Petrified Woods are a type of conifer tree, similar to modern Pine, Fir, and Redwood trees. One notable exception is the Petrified Palm Wood found in Indonesia.
Agatized Coral begins in water but similarly involves a sudden covering of fine-grained sedimentary materials, gradually replacing the organic material with minerals. Any kind of Coral can potentially be fossilized. The Agatized Corals from Indonesia are generally Brain Coral, Fern Coral, Hex Coral and Honeycomb Coral. The Agatized Corals found in Florida are usually Great Star Coral. Vatican Stone is another form of fossilized Coral, in this case Stag’s Head Coral