Charcoal in Coal Tells How Much O2 Was in Ancient Atmosphere
Posted: Tue. Mar. 13, 2012 8:01 pm
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
http://news.softpedia.com/news/When-Oxygen-Fired- ... 0257.shtml