the proterozoic eon

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Definition of the proterozoic eon in English English dictionary: Proterozoic
Proterozoic Eon: Younger of the two divisions of Precambrian time, from
Proterozoic Eon: 5 billion to 543 million years ago. Proterozoic rocks have been identified on all the continents and often constitute important sources of metallic ores, notably of iron, gold, copper, uranium, and nickel. The many small protocontinents that had formed during early Precambrian time had coalesced into one or several large landmasses by the beginning of the Proterozoic. Rocks of the Proterozoic contain many traces of primitive life forms, such as the fossil remains of bacteria and blue-green algae (see cyanobacteria)
Proterozoic eon: {i} (Geology) eon that represents the age when the first life appeared on Earth

the proterozoic eon

Hyphenation

the Pro·te·ro·zo·ic e·on

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