[SunkenCiv]

[snip] ...our planet's primordial atmosphere was toxic to life as we know it, consisting of carbon dioxide, nitrogen and other gases. However, by the Paleoproterozoic Era (2.5–1.6 billion years ago), a dramatic change occurred... known as the Great Oxidation Event (GOE)... the introduction of oxygen to our atmosphere was "more like a fire hose" than a trickle... the oceans and the atmosphere... contained a surprisingly large amount of sulfate, which is the result of seawater reacting with oxygen.... the ancient seawater from which those minerals precipitated had high sulfate concentrations reaching at least 30 percent of present-day oceanic sulfate as our estimations indicate. This is much higher than previously thought and will require considerable rethinking of the magnitude of oxygenation of Earth's 2-billion year old atmosphere-ocean system." [/snip]

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Thanks BenLurkin.

• The Origin of Nitrate Deposits
• The Transmutation of Oxygen into Sulphur
• The Origin of the Oceans

  [snip] Paleontological research makes it rather apparent that marine animals in some early age were more closely related to fresh-water fauna; in other words, the salinity of the oceans increased markedly at some age in the past. [/snip]

[Mike Darancette]

Test.