The early proterozoic was the time when free oxygen was introduced to atmosphere (GOE) but, it is believed that earths environment was fully anoxic before GOE. Though, there are evidences of whiffs of oxygen before final introduction of free oxygen in the atmosphere. the large part of deeper ocean was anoxic or sub-oxic. In light of this background, I want to know the range of concentration of oxygen present in these environments.
Arvind K. Singh
@Kenneth Thank you sir, I ll go through these publication and let you know if there is any query. Thanks a lot.
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