Saturday, October 14, 2017

Pondering the Precambrian #6

Proterozoic:

NeoProterozoic:

There is evidence of a potential blacksmoker vent from the NeoProterozoic.

Ocean subduction evidence has been found in China.

Comb Jellies appear to have be the oldest divergent, yet still living, branch of animals.

Ediacaran:

An Ediacaran protist fossil seems to show how those organisms' reproduction in action.

Evidence of the opening of the Iapetus Sea in Russia during the Ediacaran has been uncovered.

The submerged Batavian Knoll is a microcontinent with evidence of the assembly of Gondwana.

Biostratigraphical evidence is coming together for the Ediacaran from China.

The nuclei and nucleoli in the embryos found in Ediacaran China's Weng'an Biota.

Understanding the Ediacaran paleoecologies.

Should the extinction of Cloudina lucianoi mark the Ediacaran/Cambrian boundary?

Could Ediacaran rangeomorphs actually burrow?

Cryogenian:

It appears the Sturtian Snowball Earth episode began circa 717 million years ago.

Tonian:

The Tonian/Cryogenian boundary has been proposed for specific spots in Scotland.

A vase shaped microfossil has been found in the Tonian deposits around the world.

There appears to have been a mass extinction during the Tonian prior to the Snowball Earth episodes.

Mesoproterozoic:

There is evidence Archean granites were reworked and uranium deposited during the Calymmian in the Olympic Dam Breccia in Australia.

Eukaryote fossils were found in Calymmian deposits in China.

Are some fossils that are normally thought to be NeoProterozoic (Tonian/Cryogenian) found in the MesoProterozoic deposits of Russia?

At the dawn of the Mesoproterozoic, at the Statherian/Calymmian boundary, Australia made contact with northwestern Laurentia and began a long slide along its margin.

Paleoproterozoic:

Evidence of an island arc from the Paleoproterozoic came from West Africa.

There may have been two island arcs in Finland during the PaleoProterozoic.

How the Francevillian formation formed in the Rhyacian.

The microfossils of the Francevillian Biota get examined.

Evidence from India for proto continents in the Rhyacian.

Archean:

Findings from the NeoArchean from the North American Craton support local evidence of plate tectonics.

Did the development of carbonate platforms in the NeoArchean pave the way for the Great Oxygenation Event?

Is there evidence of biogenic atmospheric oxygen during the MesoArchean?

The emergence of the continents may have happened over multiple differentiation events.

Evidence of life was found in EoArchean sediments from Labrador, Canada.

Hadean:

Caution should be taken when examining Hadean zircons.

Did life form in warm little pools?

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