The oldest fossil evidence that geochemists have been able to find in deposits in Pilbara, Australia, and South Africa have been dated to 3.5 bya. In addition, organic compounds that may be the result of those produced by organisms have been dated, also in Greenland, to 3.8 bya.
A. the location and strength of the earthquake
The definitions of "sector 3" and "stratum D", the layout of the sectors,
and the behavior of the strata would go a long way toward explaining
that mysterious absence.
