CLASS 4:
PROTEROZOIC EON
The Proterozoic Eon represents a fascinating time in Earth's history, marked
by "rapid" changes in tectonism, rock associations, continental
assemblages, atmospheric conditions and life forms.
TECTONICS
Supercontinent Assembly
(Rodinia and Gondwana)
Supercontinent
Rifting
Pan
African Orogeny
Progression to Modern Tectonics
ROCK ASSOCIATIONS
BIFs
Greenstones
& Granulites
LIFE
Prokaryotes-
~3.5 Ga
Single celled;
Lack specific cell function
Eukaryotes-
~ 1.6 Ga
Nucleus
Chloroplasts;
Mitochondria
Sexual reproduction