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Precambrian era
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Precambrian era

In geology, the time from the formation of the Earth (4.6 billion years ago) up to 570 million years ago. Its boundary with the succeeding Cambrian period marks the time when animals first developed hard outer parts (exoskeletons) and so left abundant fossil remains. It comprises about 85% of geological time and is divided into two eons: the Archaean and the Proterozoic.
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Topics include Precambrian tectonics and the supercontinent cycle, implications of plate tectonics for environmental change, large igneous provinces, rifted continental margins, ocean ridges, continental transforms, subduction zones, and many organic examples.
Global tectonics, 3d ed by SciTech Book News
An explosive and previously unrecognized greening of the Earth occurred toward the end of the Precambrian and was an important trigger for the Cambrian explosion of life," said Knauth.
Massive greening of Earth 700 mln yrs ago triggered off explosive ... by Asian News International
Finding ore deposits in footwalls, identifying gold veins alongside gabbro, it is all indicative of the mysteries behind the Precambrian Shield.
Houston lake's next step in West Cedartree by Louiseize, Kelly / Northern Ontario Business
 
 
 
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