Periodicity of global geologic and biologic events in the Phanerozoic

In the Phanerozoic 17 global events took place, which were characterized by intense basaltic magmatism, active formation of uranium deposits, accumula tion of marine radioactive uraniferous black shales, increase in the enviro nment radioactivity, and, as a result, mass extinction of old fauna and app earance of new species of organisms. The greatest events (V-C, D-C, J-K) occurred every 216-217 Ma, i.e., every galactic year. During this period, similar events took place every ca. 30 M a. The proposed periodic system includes three large periods (galactic years) and seven series of similar events.