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Heart Lake Geyser Basin and the 3 springs selected for analysis. The HLGB (as viewed from Mount Sheridan; B) is located in the southern portion of YNP (A). The 3 springs selected were located in the Western Subgroup. The springs were at 44°C (C), 63°C (D), and 75°C (E) and all were at pH 8.5 in 2007. The image of the 44°C spring (C) was taken in 2009 and shows tears throughout the microbial mat that were not observed in 2007 or 2008.
