Kawéntenannyane sané  terus mamargi miwah tata titi makakalih glasiasi kantun kaselehin miwah méwehan kasobyahang yéning saihang sareng Proterozoic Snowball Earth utawi Bumi Bola Salju Proterozoikum.
The intensity and mechanism of both glaciations are still under investigation and harder to explain than the early Proterozoic Snowball Earth.