During the Proterozoic era, oxygen produced by photosynthesizing bacteria collects in the oceans and then in the atmosphere. Iron present in exposed rocks reacts with this oxygen, and rust colors ...
Ruling the shallow sea for roughly 96 million years, the Ediacara fauna went extinct about 539 to 500 million years ago, marking the end of the Proterozoic Eon and the beginning of the Phanerozoic ...
The FIRE 1 profile crosses three tectonic regions: the Archean nucleus in the east, the Archean–Proterozoic transition zone, and the Paleoproterozoic (Svecofennian) rocks of the Savo belt and Central ...
Unconformity between the metamorphic Proterozoic basement complex and the Paleozoic sediment strata. Research led by C.B. Keller in 2019 first proposed that widespread erosion by continental ice ...