An article on Eurekalert has an article saying that cyanobacteria, the supposed earliest life on earth which produced oxygen, saying that they came ~1 billion years after than assumed. In Carrine Blank's model, sulfur-loving bacteria came ~2.4 billion years ago and the cyanobacteria about 100 million years about that. If this theory is correct, how do banded iron formations, etc fit in? Blank used genetic family trees to support this. Using the genetic tree, Blank was able to show that cyanobacteria would branch off last of the primitive bacteria.
Eurekalert