Yellowstone Bacterial Mat
The runoff from this geyser hosts an interesting juxtaposition of Archaea and bacteria living in different temperature ranges. Thermophilic algae (Cyanadium) are green and live in waters 38-56oC. Reddish deposits are siderophilic (iron-loving) Archaea ranging between 50-60oC. http://blackquartz.com/yellowstone.html
They are so beautiful and so delicate! Just a little earth science lesson for today.