Cambrian reef formation in Russian territory

The Cambrian reef formation was limited by the Early and Middle Cambrian ep ochs and culminated in the Lenian-early Amgian time. Reef builders of that time were not diverse, and their agglutinative forms prevailed over ahermat ypic and, certainly, hermatypic reef-builders. Accordingly, the buildups ha d a flattened shape and gentle slopes. Relations between reefs and geotecto nic structures of the oceanic and continental types are outlined.