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. 2014 Nov 12;5:610. doi: 10.3389/fmicb.2014.00610

Figure 1.

Figure 1

Plan-view map of sample sites and photographs of sample sites [2 (D), 5 (C), 8 (E), 6 (F), and B (G)]. Sample locations within SURF. (A) Maps of the 800 ft level and (B) 4850 ft level showing sampling locations in circles, boreholes in blue, and tunnels in black, red, and yellow. The numerical grid is an internal reference coordinate system in feet. (C) Borehole 5 with cascade of iron oxide rich biofilm extending from the source to the tunnel floor below. (D) Close up of borehole 2 biofilm showing in-line filtering apparatus and microterraced biofilms. (E) Photo of borehole 8 showing water spraying forcefully from the source and thick hanging microbial mats. (F) The edge of Pool 6 showing elemental sulfur deposition (white), dark biofilms and mineralization (black), and iron oxides (orange). (G) Manifold D during in-line filtration and sampling. Photos were taken by Magdalena R. Osburn.