Geological Time Scale
The evolution of life from unicellular bacteria to the modern man is given below:
| Eons | Era | Period | Epoch | Age/Years before Present | Life/Major Events |
| Cainozoic
(from 65 million years to the present times). Mesozoic 65 – 245 Million Paleozoic 240 – 570 Million |
Quaternary
Tertiary Cretaceous Jurassic Triassic Permian Carboniferous Devonian Silurian Ordovician Cambrian |
Holocene
Pleistocene Pliocene Miocene Oligocene Eocene Palaeocene |
0 – 10,000 Million
10,000 – 2 Million 2 – 5 Million 5 – 24 Million 24 – 37 Million 37 – 58 Million 57 – 65 Million 65 – 144 Million. 144 – 208 Million. 208 – 245 Million. 245 – 286 Million 286 – 360 Million 360 – 408 Million. 408 – 438 Million. 438 – 505 Million 505 – 570 Million. |
Modern Man
Homo Sapiens Early Human Ancestor. Ape: Flowering plants and Trees. Anthropoid Ape. Rabbits and Hare. Small Mammals: Rats and Mice. Extinction of Dinosaurs. Age of Dinosaurs. Frogs and Turtles. Reptiles dominate – replace amphibians. Fresh reptile: Vertebrates: coal beds. Amphibians. Fresh trace of life on land; Plants. First fish. No terrestrial life: Marine invertebrate. |
|
| Proterozoic
Archean Hadean |
Pre-Cambrian
570 – 4800 Million |
570 – 2500 Million
2500 – 3800 Million 3800 – 4800 Million. |
Soft bodied arthropods.
Blue green algae: unicellular bacteria. Oceans and continents form: Oceans and atmosphere are rich in carbon dioxide. |
||
| Origin of Stars
Supernova Big Bang |
5000 – 13,700Million. | 5000 Million
12,000 Million 13,700 Million. |
Origin of the Sun.
Origin of the Universe. |
Origin and Evolution of Earth: History and Timeline
Origin and Evolution of Earth: Earth was formed around 4.54 billion years ago. Early theories like the Nebular Hypothesis, Revised Nebular Hypothesis, Binary Theories, etc. explain the Earth’s origin and evolution. On the other side, modern theories like the Big Bang Theory, Star Formation Theory, and Planet Formation Theory explain the origin and evolution of the Earth.
Earth’s evolution involves mainly the creation of the Lithosphere, Atmosphere, and Hydrosphere. The evolution of the Earth also explains that around 3.5 billion years ago life emerged on this planet. While “evolution” typically refers to biological changes it can also apply to the processes shaping planets, stars, galaxies, and the universe, despite their distinct nature. In this article, we will discuss the origin and evolution of the Earth in detail.
Table of Content
- The Origin of Universe
- Early Theories of Origin of Earth
- Modern Theories of Origin of Earth
- Evolution of the Earth
- Geological Time Scale
- Origin Of Solar System
- Origin Of The Life
Origin and Evolution of Earth