-
5 billion years ago
the solar system was born. -
4.6 billion years ago
earth began to form. -
3.8 billion years ago
bacteria diversify -
3.7 billion years ago
photosynthesizing bacteria form -
3.5 billion years ago
oldest fossil -
2.2 billion years ago
oxygen appears, causing damage to living tissue -
1.8 billion years ago
oldest eukaryotic fossils -
800 million years ago
major glaciation period begins -
600 million years ago
protective ozone layer in place. -
480 million years ago
first land plants and fish -
400 million years ago
oxygen nears current day levels -
350 million years ago
reptiles appear -
250 million years ago
the permain extinction causes 90% of all species go extinct -
220 million years ago
first mammals appear -
200 million years ago
pangea starts to break apart -
65 million years ago
cretaceous extinction causes 60-80% of all species to go extinct -
60 million years ago
Primates appear -
5.2 million years ago
Hominids appear -
100,000 years ago
Modern humans appear. animals over 45 pounds go extinct due to late pleistocene extinction