This is a plate of Upper Ordovician, Bryozoan fossils
primary of the species Chasmatopora papillosa and Pseudohornera bifida. They come from the Viivikonna Formation in Northeastern Estonia. The bryozoa have a white preservation that contrasts well against the lighter brown shale. Comes with an acrylic display stand
Bryozoans are microscopic aquatic invertebrates that live in colonies, forming skeletal structures. The form of these skeletal structures is unique to each particular species. The individual Byrozoans which form the colonies are called zooids and are filter feeders, straining nutrients from the surrounding water.