Phanerozoic
1, Cenozoic
(1) Quaternary system
Started at 1.806 and 0.005 million years ago. During the ice age, a large number of large mammals became extinct and human beings were born.
(2) Neogene
It started 5.332 years ago. Apes, the ancestors of mankind, appeared.
(3) Paleogene
(1) It started 33.9 years ago, 0. 1 10,000 years ago. The rise of most mammals.
(b) It started 65.5 years ago. Angiosperms flourish.
2. Mesozoic
(1) Cretaceous
It started 99.6 years ago. Extinction at the end of Cretaceous: dinosaurs and other organisms became extinct in large numbers, and mammals with placenta appeared.
(2) Jurassic
Started from 199.6 years ago. Birds appeared, marsupials appeared, dinosaurs flourished, angiosperms appeared, and gymnosperms flourished.
(3) Triassic
It started 25 1.0 years ago. Dinosaurs appeared, Pangu (Pangu) was formed, and egg-laying mammals appeared.
3. Paleozoic. Originally known as PRIMARY
(1) Permian
It started 800 thousand years ago. 95% of life on the earth has been extinct, and the outline of Pangea is emerging.
(2) Carboniferous
It started 359.2 years ago, 2.5 million years ago. Reptiles appear and insects flourish. Gymnosperms appeared, ferns flourished and coal was formed.
(3) Devonian
It started 4 16.0 years ago. Amphibians appeared, fish flourished and insects appeared. Lycopodium and equisetum appeared, and so did seed plants.
(4) Silurian
It started 443.7 years ago,10.5 million years ago. Terrestrial gymnosperms appear.
(5) Ordovician
It started 488.3 years ago, 1.7 million years ago. Fish appeared and algae flourished.
(6) CAMBRIAN
It started 542.0 years ago, 1.0 million years ago. The CAMBRIAN explosion of life.
4. Precambrian. Compare CRYPTOZOIC
(1) began 630+5/-30 million years ago.
Multicellular organisms appear.
(2) It started 23 million years ago.
Cyanobacteria and bacteria flourish.
(3) It started 2.5 billion years ago.
Iron formation period (an important iron ore formation period).
(4) It started 3.6 billion years ago.
Blue-green algae appeared.
(5) It started 3.85 billion years ago.
The earliest living things on the earth-bacteria.
(6) It began 410.5 billion years ago.
There are oceans on the earth.
(7) It started 4.57 billion years ago.
The earth was formed.