Decades: 30s BC 20s BC 10s BC 0s BC 0s - 10s - 20s 30s 40s 50s 60s
Years: 7 8 9 10 11 - 12 - 13 14 15 16 17
Births
Deaths
For the number 12, see twelve.
... Era. The Palaeozoic covers the time from the first appearance of abundant hard-shelled fossils to the period when the continents were first dominated by large, relatively ...