THE GEOLOGICAL TIME TABLE
Reading edition
1.0 = One million years
ERAS PERIODS TIME SCALE (After Barrell) CHARACTERISTIC LIFE
Minimum Maximum
PSYCHOZOIC Recent 1 1.5 Age of Man
CENOZOIC Pleistocene
Pliocene 7 9 Age of Mammals and Modern Flowering Plants
Miocene 19 23
Oligocene 35 39
Eocene 55 65
MESOZOIC Cretaceous 95 115 Age of Reptiles
Comanchian 120 150
Jurassic 155 195
Triassic 190 240
PALEOZOIC Permian 215 280 Age of Amphibians and Ancient Floras
Pennsylvanian 250 330
Mississippian 300 370 Age of Fishes
Devonian 350 420
Silurian 390 460 Age of Higher Shelled Invertebrates
Ordovician 480 590
Cambrian 550 700
PROTEROZOIC Systematic classification variable 925 Age of Primitive Invertebrates
Long Erosional Interval
ARCHEOZOIC 1500 Dawn of Unicellular Life, Algal Forms Reported