Pondering the Precambrian #2

Precambrian in General:

The magnetic field of the Earth has been surprisingly consistent over the course of Deep Time despite the changes happening internally.

Eukaryotes appear to have acquired mitochondria late in the process of their evolution away from other forms of life.

Studying modern stromatolites gives insight to Precambian life.

What meandering rivers prior to terrestrial plant life were like.

NeoProterozoic:

Was an increase in UV light caused by rapidly flipping magnetic poles the root cause of the Cambrian Explosion?

NeoArchean:

Cerium anomalies in from NeoArchean Brazil suggest the ocean was mildly oxygenated before the Great Oxygenation Event.

MesoArchean:

Evidence subduction (and plate tectonics) were active during the MesoArchean .

PaleoArchean:

Evidence from Swaziland suggests the minerals found there do NOT support subduction (and plate tectonics) as being their source as was apparently thought previously.

Doubt is being cast on PaleoArchean carbon deposits, trace evidence of microbes, being really from the PaleoArchean.

EoArchean:

There is evidence 'proto' crust may have existed 3.8 billion years ago.