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(5 Billion years ago) Birth of the solar systems
Formed from interstellar gas and dust. Creates sun. -
(4.6 BYA) Earth began to form
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(3.8 BYA) Bacteria Diversity
Single celled bacteria are the oldest known living organism. -
(3.7 bya) photosynthesizing bacteria
Can grow larger and reprouduce faster than their competitors. -
(3.5 BYA) Oldest fossils
Sromatolites create the first extensive reef system. -
(2.2 BYA) Oxygen in the enviorment
oxygen appears in teh environment, causing damage to living tissue. -
(1.8 BYA) Oldest eukaryote fossil
Spherical in shape and float ar or near the surface of water. -
(800 mya) Global ice age
Firt of four ice ages. -
(600 mya) Protective ozone layer in place
Sheild critical factor in the emergence and survival of complex life and land.
Protected organisms from harmful UV rays so they could exsist on land. -
(480 mya) Fishes and land plants
Hag fishes and lampreys are the only jawless fishes alive today. -
(400 mya) Oxygen nears present day levels
Levels of 21 percent by volume of atmosphere. -
(350 mya) Reptiles
Early reptiles share many skeletal similarities with amphibians. -
(250 mya) Permian extinctions
90 % of all species go extinct. -
(220 mya) Mammals and Dinosours
Earlyest are rodentline and solitary. Inverebrate genera possible land go extinct. -
(200 mya) Pangea starts to break apart
Heat from deep within cause the pangaea supercontinent to separate. -
(65 mya) Cretaceous extinction
60-80% of all species go extinct. -
(60 mya) Primates
Live in trees in tropical or subtropic areas. -
(5.2 mya) Hominids
Begain to appear. -
(100,000 years) Modern Humans
Larger brain cases the most difference from all others. -
(100,000 years) pleistocene extinction
Nearly all mammals and birds over 40 pounds go extinct. Partically due to humans over hunting.
