A solitary rugose coral, an extinct Permian invertebrate. Voids within or around the fossil appear to have been filled by silica-rich fluids, which later crystallized as quartz or chalcedony.
Rugosa Coral
Fossils I've Found on the Beach
A solitary rugose coral, an extinct Permian invertebrate. Voids within or around the fossil appear to have been filled by silica-rich fluids, which later crystallized as quartz or chalcedony.