23.4 Precambrian Time (4500 to 543 Million Years Ago)

Precambrian Time

For Your Consideration:

"Black-band ironstone (aka)" by André Karwath aka Aka - Own work. Licensed under CC BY-SA 2.5 via Wikimedia Commons - https://commons.wikimedia.org/wiki/File:Black-band_ironstone_(aka).jpg#/media/File:Black-band_ironstone_(aka).jpg                                                                                       Photo by André Karwath

What do banded iron formations have to do with photosynthesis?

Be sure to read this chapter section in your textbook!