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The Precambrian era covers majority of the Earth' s history starting with the creation of our planet about 4.5 million years ago.
The precambrian era is the earliest of geological ages. This era was seen as the beginning of the earth.

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The name Proterozoic comes from the Greek "earlier life"
It lasted nearly two billion years, starting 2,500 million years ago to 542 million years ago. During this time, life began to evolve into more complex organisms.

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Biology, Biological Diversity, Introduction to Animal Diversity, The Evolutionary History of the Animal Kingdom | OERTX

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- The rocks from the Proterozoic era have been found in all continents and often contain important sources, such as iron, gold, copper, uranium, nickel and other metallic ores.
- Proterozoic rocks contain many definite traces of ancient life-forms, the fossil remains of bacteria and blue-green algae, as well as of the first oxygen-dependent animals.

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-life diversifys into complex multi-celled organisms, known as the cambrian explosion (cambrian)

-first vertebrates (animals with backbones) appear (ordovician)

-1st land plants appear, the 1st jaws appear, many groups of animals go extinct or nearly extinct (silurian)

-fish diversify into 3 groups and take over the oceans, and vertebrates move towards the land, and plants diversify (devonian)

-vertebrates diversify on land, oxygen levels are very high due to massive forests covering much of the land (carboniferous)

-1st distinctly mammalian ancestors appear, many species of fish go extinct, pangea begins to split, causing the largest known extintion event (permian)

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-Mesozoic era is the age of the dinosaurs and lasted almost 180 million years from approximately 250 to 65 million years ago
-During the 180 million years of the era, reptiles lived on land, in seas, and in the air

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What did the Earth look like during this era?
The era was described as oceans of liquid rock, boiling sulphur, and impact craters everywhere. The Earth was clearly different to what it looks like now a days. Volcanoes would blast off all over the place, and the rain of rocks and asteroids from space would never end. The image above shows a bit of what the world looked like.

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The solar system, including the earth, was mainly being formed by clouds of gas. On the surface of the earth, there was also a sizeable amount of crustal materials and universal debris. Throughout part of the era, impacts from extraterrestrial bodies released enormous amounts of heat that likely prevented much of the rock from solidifying at the surface. https://www.britannica.com/science/Hadean-Eon

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The Mesozoic Era was the second of Earth’s three major geologic eras of Phanerozoic time. The name for the era is derived from the Greek term for “middle life”. The Mesozoic Era started 252.2 million years ago, and ended 66 million years ago. The Mesozoic Era came to an end following the asteroid that brought about the extinction of the dinosaurs. The Mesozoic Era was split into three major epochs or periods, these were the Triassic period, the Jurassic period, and the Cretaceous period. The Mesozoic Era is best known as the time of the dinosaurs. In the initial stages of the Mesozoic Era, all of Earth's were joined together, forming the super continent known as Pangea. By the end of the Triassic epoch, Pangea had broken up into the continents of Laurasia and Gondwana. And by the end of the Mesozoic Era these continents had further broken up, eventually forming the continents we know today.

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by the date 2500 some of the most spectacular structures in all world history have been built - the Great Pyramids of Egypt. Stone Age hunter-gatherers and farmers live in much of the world. In one small area, however, cities are appearing, literacy is developing, and civilization is emerging.

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- the Paleozoic era is major interval of geologic time that began 541 million years ago with the "Cambrian" explosion, an extraordinary change of marine animals, and ended about 252 million years ago. it was the greatest extinction event in earth history.
- there were two main groups of animals living in the era. the first were marine reptiles which included lizards and snakes and the second were archosaurs which included crocodiles, dinosaurs and birds.
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Timeline: Here is a timeline representing this era

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Around 1.2 billion years ago, organisms called stromatolites were widely present around the earth. These stromatolites still exist today. The earliest stromatolite organisms are blue algae, which are thought to have prepared the earth for more complex life by using photosynthesis to produce food and oxygen. These stromatolite organisms declined in numbers and diversity as time went on. A possible reason for this is the evolution of grazing life forms that could have eaten these stromatolites. Stromatolites now live in high salinity bodies of water, where the salinity wards off potential grazers. An example of where you can find stromatolites is in Shark Bay, Australia.

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- This era includes 3 well known periods called the Triassic, Jurassic, and Cretaceous periods. A mass-extinction marked the beginning and end of the Mesozoic Era.

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- The Flora and Fauna evolved to the  state they are today.
- (First Image) The Purple shows the land bridge that linked places in this time.
- The word Cenozoic is derived from greek meaning recent life.
- Most Sedimentary Rocks are formed at this time
-Many well known mountain ranges were built during. Some of these include the Alps, Carpathians, Himalayas and the Atlas Mountains.
-Mammals evolution exploded during this time.
-After the dinosaurs went extinct the mammals had a lot less predators and made it easier to evolve.
-Some examples of early mammals are Saber-Tooth Tiger, Giant Ground Sloths, and Wooly Mammoths. (Second Image)
- The most recent ice age killed of many of the large animals because they need more food and heat to stay alive.
-Humans did not evolve until the Pleistocene era.

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The Archean Eon was an Era that occured between 540 million and 4.6 billion years ago. It is the period where life first formed on Earth. There was actually no oxygen during this period, it slowly accumulated on Earth and now that is actually a necessity for humans.

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- It began around 65 million years ago and continues into the present
- The third major eras of Earth's history

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The Cambrian climate was most likely moderate at first, becoming warmer over time as the second greatest sea level rise in the Phanerozoic. The Early Paleozoic ended with the short but possibly severe Late Ordovician Ice Age.

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Little microscopic blue green algae was found in the Precambrian at that time.

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Although no one knows when the first outer crust of the planet formed, some scientists believe that the existence of a few grains of zircon was around 4.4 billion years ago.

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one of the first vascular land plants, late silurian

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The Anomalocaris was the first predatory animal in the Precambrian as you can see.

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a diagram of an early "sea scorpion", a group of large arthropods from the ordovician

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 The oxygen in the Archean atmosphere was gathered from "organic photosynthesis of carbon dioxide and water by anaerobic cyanobacteria" ( which is blue/green algae), a process that releases oxygen . "Although oxygen did not accumulate in a large amount in the atmosphere until early Proterozoic time", the process of creating oxygen started toward the end of Archean Eon.

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 The oxygen in the Archean atmosphere was gathered from "organic photosynthesis of carbon dioxide and water by anaerobic cyanobacteria" ( which is blue/green algae), a process that releases oxygen . "Although oxygen did not accumulate in a large amount in the atmosphere until early Proterozoic time", the process of creating oxygen started toward the end of Archean Eon.

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Intelligent search from Bing makes it easier to quickly find what you’re looking for and rewards you.

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A large, armored fish with bone blades for teeth called a placoderm, late devonian

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a small, lizard-like ancestor to the group that would give rise to the dinosaurs, from the carboniferous

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a synapsid, a group that would give rise to true mammals (early-mid permian)

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a more advanced synapsid, showing more traits associated with mammals, like multiple kinds of teeth, and possibly hair or fur (late permian)