| Years Before Present (Not to scale) | Event | How Long Ago | Time & Date (converted to 1 year) |
| Present climate; modern humans; | |||
| 40,000 | **************************************************************** | 6 minutes | 2354 hours 31 Dec |
| Recent ice ages; various human species; mammoths | |||
| 1,640,000 | **************************************************************** | 4 hours | 2000 hours 31 Dec |
| Near-human species, Australopethecines; near modern mammals | |||
| 5,200,000 | **************************************************************** | 13 hours | 1100 hours 31 Dec |
| Apes flourish; garsses and savanah develop; grazing animals evolve | |||
| 23,300,000 | **************************************************************** | 2 days 10 hours | 1400 hours 28 Dec |
| Monkeys, apes and other mammal species evolve | |||
| 35,400,000 | **************************************************************** | 3 days 17 hours | 0700 hours 27 Dec |
| Posimiams flourish; first monkeys and precursors | |||
| 56,500,000 | **************************************************************** | 5 days 19 hours | 0500 hours 25 Dec |
| Earliest primates (protoprosimians); Mammals diversify | |||
| 65,000,000 | *************************************************************** EXTINCTION | 6 days 19 hours | 0500 hours 24 Dec |
| Archaic mammals and birds begin to replace dinosaurs; flowering plants develop | |||
| 146,000,000 | **************************************************************** | 15 days | 16 Dec |
| Dinosaurs dominant; primitive mammals spread; first toothed birds; squid; frogs and salamanders | |||
| 208,000,000 | **************************************************************** | 22 days | 9 Dec |
| Earliest primates (protoprosimians); Mammals diversify | |||
| 245,000,000 | *************************************************************** EXTINCTION | 25 days | 6 Dec |
| Spread of reptiles and insects; first mammal-like reptiles | |||
| 290,000,000 | **************************************************************** | 30 days | 1 Dec |
| Amphibians dominant; conifer florest flourish; repiles and modern insects appear | |||
| 363,000,000 | *************************************************************** EXTINCTION | 37 days | 24 Nov |
| Fish dominant; amphibians appear; first forests | |||
| 409,000,000 | **************************************************************** | 43 days | 18 Nov |
| First land plants; fish with jaws; first air breathing animals on land | |||
| 439,000,000 | *************************************************************** EXTINCTION | 45 days | 16 Nov |
| Invertebrates dominant; first vertebrates; jawless fish | |||
| 510,000,000 | *************************************************************** EXTINCTION | 53 days | 8 Nov |
| Invertebrates dominant; worms, jellyfish, trilobites, etc.; first plants? | |||
| 570,000,000 | *************************************************************** EXTINCTION | 59 days | 2 Nov |
| Unicellular forms prominant; first multicellular forms as invertebrates | |||
| Eukaryote explosion – Oxygen Levels Increase | |||
| 800,000,000 | **************************************************************** | 83 days | 7 Oct |
| Aerobic eukaryotes with mitochondria and chloroplasts as engulfed protocysts; early land plants cause buildup of oxygen | |||
| 1,500,000,000 | **************************************************************** | 156 days | 26 July |
| Unicellular forms prominant; ironoxide bands in red beds show oxygen building up in atmosphere | |||
| 1,800,000,000 | **************************************************************** | 187 days | 24 June |
| Unicellular forms predominant; cyanobacteria purple algae start producing oxygen | |||
| Oxygen First Appears in the atmosphere | |||
| 2,000,000,000 | **************************************************************** | 208 days | 3 June |
| Unicellular forms predominant; algal mats in fossil record | |||
| 2,700,000,000 | **************************************************************** | 281 days | 22 March |
| Unicellular forms predominant; first eukaryotes (anaerobic forms without mitochondria) | |||
| 3,000,000,000 | **************************************************************** | 321 days | 20 Feb |
| First evidence of life; prokaryotes | |||
| First Life | |||
| 3,400,000,000 | **************************************************************** | 354 days | 10 Jan |
| Simple carbon compounds found in ancient rocks from this age | |||
| 3,500,000,000 | **************************************************************** | 358 days | 6 Jan |
| Permanent crust, oceans and atmosphere formed; | |||
| Conditions Suitable for Life | |||
| 4,000,000,000 | **************************************************************** | 365 days | 1 Jan |
| Planet Water formed as a planet | |||
| 4,600,000,000 | **************************************************************** | ||
| BIG BANG | |||
| 15,000,000,000 | **************************************************************** |