Cambrian
The Cambrian period, Cambrian, is the first system of the Paleozoic Eratism, in the stratigraphic scale follows the rhyme and preceded the Ordovician system. It came 541.0 ± 1.0 million years ago, ended 485.4 ± 1.9 million years ago. Deposits of the Cambrian period are on all continents. In Cambrian, the processes of subsidence, which caused intensive accumulation of sediment in geosynclinal belts, and on ancient platforms, prevailed.