The Proterozoic Eon is also called the Cryptozoic ("age of hidden life"). About 2.5 billion years ago, enough shield rock had formed to start recognizable geologic processes such as plate tectonics.

Archean and Proterozoic History Reading: Chapter 8 This is a hard chapter to read. There's a lot of names and regional detail that we are not going to deal with. Try to filter out as much as you can ...

Sedimentary reduced matter cycling Our model for the regulation of atmospheric oxygen at low Proterozoic levels hinges on an explicit consideration of the accumulation and tectonic recycling of ...

Proterozoic life was generally smaller and squishier -- like sea sponges that didn't develop mineral skeletons -- and left fewer traces to fossilize in the first place.

Advanced tools and expanded fossil datasets have painted a clearer picture of the eukaryotic diversity of the Proterozoic eon, which has been hard to quantify. The findings show that Earth's ...

Middle Proterozoic (1.5 Ga) Horodyskia moniliformis Yochelson and Fedonkin, the oldest known tissue-grade colonial eucaryote / Mikhail A. Fedonkin and Ellis L. Yochelson ...

"Based on a symposium entitled 'Proterozoic crustal dynamics and lithospheric evolution' that was held during the special session on the International Lithosphere Programme at the 27th International ...

The paper shows that the Proterozoic climate was temperate until temperatures began to fall during the early Paleozoic, around 500 million years ago.

In general, however, the microfossils here described comprise what may be termed "typical" Proterozoic microbiotas, assemblages that are dominated by, and may be composed exclusively of, filamentous ...

Nicholas Van Wyck, Marc Norman 1, Detrital Zircon Ages from Early Proterozoic Quartzites, Wisconsin, Support Rapid Weathering and Deposition of Mature Quartz Arenites, The Journal of Geology, Vol. 112 ...