Oxygen - A Four Billion Year History

Donald E. Canfield, Central 551.5112 C222o 2014

Skimmed, seeking Canfield Ocean description

.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