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Charcoal in Coal Tells How Much O2 Was in Ancient Atmosphere

Posted: Tue. Mar. 13, 2012 8:01 pm
by lsayre
And apparently back when what was eventually to become anthracite was first being deposited, there was as high as 30% to 35% oxygen in the atmosphere. Today it is about 20.8%.

http://news.softpedia.com/news/When-Oxygen-Fired- ... 0257.shtml