Quotes About Stromatolites

For 2 billion years this is all the life there was on earth, but in that time the stromatolites raised the oxygen level in the atmosphere to 20 percent—enough to allow the development of other, more complex life-forms: me, for instance. My gratitude was real.

stromatolites—a kind of living rock made by billions and billions of microscopic cyanobacteria. The tiny respirations of these organisms over millions of years largely created Earth's oxygen-rich atmosphere, paving the way for more complex living things.

an atmosphere ultraviolet rays from the sun, even from a weak sun, would have tended to break apart any incipient bonds made by molecules. And yet right there"—she tapped the stromatolites—"you have organisms almost at the surface. It's a puzzle.