This is a very detailed group of Bryozoa from the Potter Farm Formation of Michigan.
These creatures are animals and are commonly called “moss animals” They are tiny colonial filter feeders.
Though they may look like tabulate corals, they are not. These are some of the most abundant fossils found in certain deposits.
There are two major types, branching and encrusting. Often the branching resembled twig-like structures and also acted as reef builders. The encrusting would normally cover rocks and discarded shells on the ocean floor.
Bryozoans all had tiny tentacles that filtered the water for food. Each creature lived in the indentations. They often made up huge colonies of several thousand individuals.
These are presented in this handsome glass topped leatherette case that is 3 1/4 inches by 4 1/4 inches.
These are the specimens you will receive.