DEFINITION OF NEOPROTEROZOIC

The last of three major eras of the Proterozoic

era, the Neoproterozoic stretches from 900 to 544

million years ago. The Neoproterozoic was a time of major

global-scale tectonic, biologic, and climatic change. The

supercontinent of Rodinia broke up and the continental fragments

rearranged themselves in the supercontinent of Gondwana,

closing several large ocean basins in the process. The

breakup, dispersal, and re-amalgamation of the main continents

in the Neoproterozoic caused many global climatic

changes, which together with the changing environments on

the continental margins provided many environments and

stimuli for life to dramatically change in this period. One of

the great debates that are currently active in geology is

whether and how the dramatic biologic, climatic, and geologic

events that mark Earth’s transition from the Precambrian

into the Cambrian can be linked to the distribution of continents

and to the breakup and reassembly of a supercontinent.

See also GONDWANA.

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