= Oxygen - A Four Billion Year History =
== Donald E. Canfield, Central 551.5112 C222o 2014 ==
Skimmed, seeking ''Canfield Ocean'' description
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.p117 GOE Great Oxygen Event ended BIF Banded Iron Formations ...
 . Until a lot of buried carbon oxidized, drawing oxygen back down
 . sulfates from oxygen weathering of sulfide minerals, iron sulfiide sediments instead
.p119 black shales deposited in sulfidic waters, evidence in Gunflint-Rove fFormations