02 April 14. While you can see thermophiles in many different locations within Yellowstone National Park, nowhere are they more prevalent than in the Midway Geyser Basin. Here you can see them in huge arrays and some simply dominate the landscape of certain geyser areas. As I've mentioned previously, different colors represent different water temperatures, and this mat of thermophiles would suggest that the water temp is between 55º and 60º C. Of passing interest is their degree of concentration; a 3"x3" chunk of these thermophiles mats are said to contain more microorganisms than the human population of the Earth. One can only wonder what Malthus might have to say about this. The day I took this shot it was on the chilly side and the water vapor coming off the geyser was being blown directly towards me with just very brief breaks in the veil. Even with the breaks, the amount of moisture present was more like shooting from inside a cloud rather than out in the open, so the image looks a bit as if I had tried to do something creative with it like shooting through a filter to slightly soften it which wasn't the case; nature was doing that for me. The thermophile field in this shot extends all the way to the back of the frame to where you can still see a bit of red on the left; to the right is part of the expansive pool of water which shows as a faint blue. These hot spots in the midway geyser basin are truly hard to imagine until you actually see them. If you think you might find this type of thing to be of interest, you might want to go soon. Since they had a 4.2 magnitude earthquake in West Yellowstone just a couple of days ago, the possibility exists that another could be disruptive to the area. Nikon D300s; 18 - 200; Aperture Priority; ISO 200; 1/500 sec @ f /11.