-
5 billion years ago Birth of solar system
Universe exploded into existence from nothing -
4600 million years ago Earth began to form
earth began to form -
3800 millon years ago Bacteria Diversity
most bacteria reproduce by making carbon co press of themselves -
600 years ago. Ozone
Protective ozone layer in place -
480 years ago Plants
Land Plants -
400 years ago. Oxygen
Oxygen nears present day levels -
3.7 million years ago Photosynthesizing bacteria
early microbes thrive an oxygen free enviroment feeding an organic molecule -
3500 million years ago..Oldest fossils
As fine sediment is trapped between these layers the mats bind together and harden -
2200 million years ago. Oxygen
Oxygen appers in the environment, causing damage to living tissue -
1800 million years ago Oxygen levels reach three percent
Oxygen how composes three percent of the atmosphere -
800 years ago. Global ice age
Major glaciation period begins -
350 years old. Carbon
carbon sinks "coal forest" -
250 years ago. Endpermain
about 90% percent of all species go extinct -
220 years ago . Mammals
-
200 years ago
pangada starts to break apart -
65 years ago higher extinction rate
60 to 80 percent go extinct -
60 years ago. Primates
Primates begin to roam the earth. -
5.2 mya
homiaids begin to appear -
100,000 years ago humans
modern humans -
100,000 years ago animal extinction
animals over 45 percent go extinct.
