Geologic Timescale By 93xbw Jan 1, 1909 Cambrian Era Sep 1, 1920 Ordovician Era Sep 29, 1927 Silurian Era Sep 29, 1936 Devonian Era Sep 29, 1947 Carboniferous Era Sep 29, 1957 Permian Era Sep 29, 1962 Triassic Era Sep 29, 1972 Jurassic Era Sep 29, 1985 Cretaceous Era Sep 30, 1996 Tertiary Era Sep 30, 1999 Quaternary Era
