Table 2.
Date constraint | Upper limit (Ma) | Lower limit (Ma) |
---|---|---|
Ancestral aerobic metabolism | 2,450 | −1 |
Fossil akinete | −1 | 1,200 or 1,600 |
Mitochondrial lineage ancestor | −1 | 1,400 |
Chlorobactane/Isorenieratane biomarker | −1 | 1,640 |
Blattodea obligate symbiont | 411 | 125.71 |