What is Proterozoic Eon?

Proterozoic Eon is one of four years of time to create the history of this planet. It is the third of four sciences, the first two with a small preserved life, the last two with it. Eony includes Hadean, Archan, Proterozoic and Phanerozoic. Proterozoic means "early life" and ranges from 2500 million to approximately 542 million years. Traditionally, all periods before the Cambrian period (which began 542 million years ago) were informally referred to as "before Cambrian", but recently this time period has been divided and named.

Originally, the Proterozoic EON referred to the era before the emergence of numerous multicellular fossils. However, relatively recent discoveries of complex pre-Kambian organisms called EDIACAAN BIOTA have caused this convention to disorder. However, these appeared only a few tens of millions of years before Cambrian, so the rough outline of the Proterozoic is still correct. The Proterozoiceon is divided into three geological times of roughly the same duration: paleoproterozoic, Mesoproterozoic and neoproterozoic.

Proterozoic makes up more than half of the history of life on Earth. Although life originated before a proterozoic, most of it is very poorly maintained and little is known about it. Even the fossil details from the Proterozoic are sketchy. In the early part of the era, perhaps exclusively, unicellular photosynthetic organisms, which are descendants of today's cyanobacteria. They sometimes gathered into colonies reminiscent of beads on the chain. Some of the more complex specimens were closely integrated colonies of prokaryotic cells, reaching up to 1 mm, considered to be among the first eukaryotes (complex, larger cells).

At the beginning of the Proterozoic, the atmosphere of 100 to 1000 times the carbonated carbonar and today's atmosphere, which is more similar to the atmosphere of Mars than today's country with which we are known. Relatively suddenly, about 2000 million years ago, photosynthesizing oxygen -producing organisms developed and released huge manyOxygen in case of known oxygen disaster. This rusted exposed iron on the surface and left behind geological evidence called strip iron formation. It also probably caused mass extinction among organisms that could not deal with such high oxygen concentrations.

At the end of the Proterozoic, about 800 million years ago, the planet was hit by an ice age so hard that many paleontologists believe that most Earth was covered with glaciers. This period is called cryogenic for its low temperatures. It is remarkable that life has survived, perhaps in slightly warmer lakes deep below the cold surface, like today's Vostok lake in Antarctica.

At the end of the Proterozoic, the unicellular anneobey, the actors of today's animals, plants and mushrooms, as well as some primitive organisms similar to the stalks. Generally, the data on the Proterozoic organisms are very rare in comparison with the erees that came after it. These organisms that lack hard shells do not get very wellLy. The most common remnants are mysterious microfosily called acritarchs that come in different shapes and sizes. They are assumed that they are fossils of unicellular photosynthetic protists.