Though not fossils in the /strictest/ sense, banded iron formations are indirectly the product of photosynthetic bacteria that oxygenated the atmosphere ~2.4 billion years ago, which caused massive amounts of oxidized iron to precipitate from sea water. And they look really cool. [768×1024]

Though not fossils in the /strictest/ sense, banded iron formations are indirectly the product of photosynthetic bacteria that oxygenated the atmosphere ~2.4 billion years ago, which caused massive amounts of oxidized iron to precipitate from sea water. And they look really cool. [768×1024]

1 week ago