Oval, up to 2 m in diameter, bioherm bodies in the Early Chokrakian basin were formed by bryozoan colonies of cheilostomates (Membranipora, Schizoporella, Cellaria, Scrupocellaria, Celleporaria) and cyclostomates (Crisia), red algae (Belokrys, 1986), and calcareous worm tubes.