Precambrian oxygen levels, the sulfide b
โ
Mangum, Charlotte
๐
Article
๐
1991
๐
John Wiley and Sons
๐
English
โ 1022 KB
## Abstract The Berkner and Marshall hypothesis suggests that the atmosphere was virtually anoxic until the late Precambrian, and that the abrupt and coincidental appearance in the fossil record of the major animal phyla reflects the rise of PO~2~ to a level that supported animal life. In a more re