Categories » Proterozoic Eon

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Ediacaran Period
This period of time lasted from 630-542 million years ago. During this time, the super continent Rodinia had split into three parts- West Gondwana, East Gondwana, and Lauraisa. East and West Gondwana formed together making the Pan Africian Orogeny. (More)
Siderian Period
Siderian refers to iron, which was prominent in banded iron formations of this time period 2500-2300 M.Y.A Timeline 2500 mya: First free oxygen is found in the oceans and atmosphere. - 2400 mya: Great Oxidation Event, also called the Oxygen Ca (More)
Palaeos Proterozoic: The Mesoproterozoic Era
Mesoproterozoic Absolute Date: 1200-1600 mya Duration: 600my http://www.sciencedirect.com/science/article/pii/S1674987113000558 Geological characterist (More)
Edicaran period.
635-540 M.Y.A. At 635 M.Y.A. The Earth\'s atmosphere was 14.4 % O2 and .20 % co2. At 540 M.Y.A. The Earth\'s atmosphere was at 16.5 % o2 and .35 % co2. Days were 21.3 hours long. Earth started to warm up from the ice age. \"Earth finde (More)
Tonian Period
Geology- Tectonic formation was Rodinia, buried cole, ice covered the Earth (Ice Age). Flora- There were no flora life forms. The only life forms at the time w (More)
The Stenian Period
The Stenian Period began 1,200 million years ago and ended 1,000 million years ago.       This picture shows us the geology of Earth when it was in the Stenian Per (More)
Ectasian Period
The Ectasian period lasted from 1400 mya to 1200 mya.           This picture of  tectonics in the Ectasian period com (More)
Mesoproterozoic Era
The Mesoproterozoic Era started 1600 m.y.a and ended 1000 m.y.a. During this era a major biologic event occurred. \"The era saw the development of sexual reproduction, which greatly increased the complexity of life to come. It was the start of dev (More)
Neoproterozioc Era: Ediacaran Period
Age: The Ediacaran, also known as Vendian was the last period of the Neoproteroozoic Era. This period lasted from about 653 million years ago until 542 million years ago. Geology: during this time period the earth was a supercontinent called Rodin (More)
Neoproterozioic Era: The Crynogenian Period
Cryogenian period is the 2nd geologic period of the Neoproterozoic Era, after the Tonian and before the Ediacaran. This period took place between 850-635mya (million years ago). All of the continents had fully assembled together to form the superc (More)
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