Evidence from massive siderite beds for a CO2 -rich atmosphere before ~1.8 billion years ago

Article Abstract:

The abundance of large, massive siderite-rich beds and their carbon isotope ratios state that the atmospheric CO2 concentration was higher than present times. It is concluded that CO2 could have provided the required green house effect to maintain liquid oceans on the early Earth.

Greenhouse effect

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High CO(sub)2 levels in the proterozoic atmosphere estimated from analyses of individual microfossils

Article Abstract:

Research suggests that carbon dioxide is a component of greenhouse gas during periods of lower solar luminosity, which dominates over methand as indicated by elevated levels of carbon dioxide in the Proterozoic atmosphere, about 10 to 200 times the atmosphereic level.

Measurement, Influence, Solar activity, Proterozoic Eon, Microfossils

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Slush find

Article Abstract:

The slushball and snowball models of the Earth are reviewed with the help of biological and geochemical evidences. The slushball model of the Earth is analyzed using favorable and opposing arguments.

Geochemistry, Glaciation

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