Evidence of Iron Bacteria in October 2016—1
November 11, 2016
I found some of what I had come looking for last month when I waded across the river. The first image is the way I saw the patch of Leptothrix discophora film as I approached. It was surprisingly large for such a young film. Young films look blue or silver or silver blue. The prismatic colors arise when the film thickens as a result of more of its being produced by the Leptothrix discophora bacteria or when the film is broken and pieces of it slide over and under other pieces. The second image is the same patch of film seen from the opposite side. You can appreciate the importance of the angle of the sun relative to the viewer in how the film appears.