1. proterozoic - Noun
2. proterozoic - Adjective
3. proterozoic - Adjective Satellite
4. Proterozoic - Proper noun
from 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms
formed in the later of two divisions of the Precambrian era
Source: WordNetproterozoic life forms Source: Internet
Laurentia is an ancient craton which forms the geologic core of North America; it formed between 1.5 and 1.0 billion years ago during the Proterozoic eon. citation The Canadian Shield is the largest exposure of this craton. Source: Internet
Geologically, the Lake Ladoga depression is a graben and syncline structure of Proterozoic age ( Precambrian ). Source: Internet
As the Proterozoic Eon drew to a close, the Earth started to warm up. Source: Internet
Tectonic history (Supercontinents) Evidence of collision and rifting between continents raises questions as to what exactly the movements of the Archean cratons composing Proterozoic continents were. Source: Internet
Earth's deep time in the Proterozoic and deeper still in the Archean is only "recounted by microscopic fossils and subtle chemical signals." Source: Internet