Bryozoa, or 'moss animals', are marine invertebrate organisms that form colonies. They are characterized by branching, lacy, or fan-like structures. The Bryozoa were one of three major groups of organisms that dominated the Paleozoic Era spanning about 540 million to 250 million years ago. Over 15,000 species of bryozoa have been found in the fossil record, while approximately 4,000 species are extant today. (Location is approximate.)
These bryozoa were harvested from the Lower Permian Supai Group exposed in northern Arizona.