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historicalmarkerproject/markers/HM1NTC_norris-geyser-basin_Yellowstone-National-Park-WY.html
The sweeping view before you is named for its porcelain-like appearance - smooth sinter deposited by centuries of thermal activity, continually glazed by minerals, hot water, and living microorganisms called thermophiles.Norris Note · Like…
historicalmarkerproject/markers/HM1NTB_emerald-spring_Yellowstone-National-Park-WY.html
A hot spring's color often indicates the presence of minerals. In a clear blue pool, the water is absorbing all the colors of sunlight except one - blue, which is reflected back to our eyes. Here in Emerald Spring's pool, another factor joins with…
historicalmarkerproject/markers/HM1NT7_fumaroles_Yellowstone-National-Park-WY.html
The hottest of Yellowstone's geothermal features are fumaroles (steam vents). Fumaroles in Norris Geyser Basin have measured up to 280°F (138°C). A plentiful water supply would help cool these features; however, steam vents are usually found on …
historicalmarkerproject/markers/HM1NSS_living-thermometer_Yellowstone-National-Park-WY.html
Can you imagine living in a geyser? Thermophiles - microorganisms that thrive in heat -are perfectly adapted to living in geysers and their runoff channels. Some live where temperatures are hottest, while others reside in cooler areas. As you look…
historicalmarkerproject/markers/HM1NSO_solfatara_Yellowstone-National-Park-WY.html
This hillside is venting. As sulfuric acid, gasses, and steam escape, they create a barren and very dangerous landscape called a solfatara: scalding mud and steam are often barely covered by hot, crumbling, decomposed rock. Unlike other geothermal…
historicalmarkerproject/markers/HM1NSL_minute-geyser_Yellowstone-National-Park-WY.html
Minute Geyser's eruptions have changed dramatically. Its larger west vent (right) is clogged with rocks tossed in by early visitors when the park's main road was near this trail - passing within 70 feet (21 meters) of the geyser. Minute once erupt…
historicalmarkerproject/markers/HM1NSE_an-exploded-bay_Yellowstone-National-Park-WY.html
West Thumb's shoreline has suspiciously crater-like contours. Its underwater profile is dramatically deeper than the rest of Yellowstone Lake. Only a massive explosion could have formed West Thumb.Though the blowout occurred 125,000 years ago, Wes…
historicalmarkerproject/markers/HM1NS4_murky-past-promising-future_Yellowstone-National-Park-WY.html
Upon its establishment in 1872, approximately 48 percent of Yellowstone's waters were fishless. This did not go unnoticed. Stocking the park's waters for anglers became a priority. The result? Over 310 million native and nonnative fish - some from…
historicalmarkerproject/markers/HM1NS1_plateau-of-fire_Yellowstone-National-Park-WY.html
The cliff in front of you shows a flood of lava in cross-section. It may be difficult to imagine the forested Yellowstone Plateau covered with bubbling, hissing lava, but the rocks contain the evidence. Up close, you can see that the dark rhyolite…
historicalmarkerproject/markers/HM1NRZ_porkchop-geyser_Yellowstone-National-Park-WY.html
The upended rocks before you are the result of Porkchop Geyser's hydrothermal explosion in 1989. Porkchop's vent failed to relieve a surge in underground pressure; it exploded creating another chapter in the geyser's dramatic history of change. Po…