Punctuated tectonic evolution of the earth
... Proterozoic activity occurreo around 2.1 Ga , with
a strong pulse, possibly global, at about 1.9 Ga,
followed by less distinct, possibly only regional
pulses [6,7]. The Phanerozoic era is defined in terms
of metazoan fossils, but its tectonic style and geochemical signatures seem to be dominated ...