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Oxygen was first produced on Earth sometime between 2.6 and 2.7 billion years ago. This occurred when a variety of algae, known as cyanobacteria, came into being.hotosynthesis releases oxygen into the Earth's atmosphere through tiny openings on the leaves of plants called stomatas. Photosynthesis is the main source of oxygen and helps to sustain life on Ea... Read More Â».
At roughly the same time (and for eons thereafter), oxidized iron began to appear in ancient soils and bands of iron were deposited on the seafloor, a product of reactions with oxygen in the seawater. What it looks like is that oxygen was first produced somewhere around 2.7 billion to 2.8 billon years ago.