Did the rock record indicate that photosynthesis began on Earth about 3.5 million years ago?

No, the rock record indicates that photosynthesis began on Earth about 3.5 billion years ago, not million. Evidence of ancient photosynthetic microorganisms, such as stromatolites, suggests that these processes were occurring during that time. This early form of photosynthesis likely involved cyanobacteria, which contributed to the gradual increase of oxygen in the atmosphere.