Talk:Proterozoic

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The Proterozoic Era was definitely from 2.5 billion years ago to 600 mya. There was an oxygen build-up on Earth and there were the first multi-cellular life forms on our planet.

I completley agree too!!!

[edit] Stratigraphic Nomenclature

I made some changes in keeping with accepted stratigraphic nomenclature. I also reworded the third paragraph (for the better, I hope), added a blurb on the Cyrogenian and Ediacaran Periods and added some links. I am teaching a course in Historical Geology this semester (first time in 15 years) and am finding Wikipedia very useful in filling in all of the picky little facts that I need for my lectures but have long since forgotten! Jay Gregg

[edit] Oxygen Atmosphere When?

From the article: "The transition to an oxygenated atmosphere during the Mesoproterozoic."

However, the Mesoproterozoic doesn't mention this, the Paleoproterozoic era article dates the Oxygen Catastrophe in the Siderian period. So which is it? Jeff schiller 17:31, 27 July 2006 (UTC)

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