Obsidian Creek heated geothermally in winter in Yellowstone Wyoming with snowmobilers

Obsidian Creek; green; cyanobacteria; cyanobacterial; mats; heated; heat; geothermally; snowmobile; snowmobilers; snowmobiling; geothermal; hot; springs; winter; snow; Yellowstone; National Park; Wyoming; steam; sulfur; acid; pH; Oscillatoria; filaments; filamentous; microbial; Tweedys rush; bacteria; thermophiles; steaming; trees; evergreen; pine; lodgepole