ナショナルジオグラフィックのインスタグラム(natgeo) - 4月12日 06時45分

Tardy Geyser in Winter
@michaelnicknichols // While the North American plate has drifted southwestward over the past 16 million years, the hotspot has left its marks in a northeastward series, from what we now call southeastern Oregon and across Idaho to its current location. The most recent of the three Yellowstone upheavals occurred about 640,000 years ago, spewing 240 cubic miles of debris into the atmosphere and leaving a rimmed crater that now encompasses Old Faithful, the Hayden Valley, and half of Yellowstone Lake. That one is known as the YELLOWSTONE CALDERA.
The implications of these geological facts are indirect but fateful. After the ash settled and the land cooled, the Yellowstone Plateau remained a site of extraordinary geothermal activity, its relatively thin skin of earthly crust floating above the hotspot’s upper magma chamber, from which heat passes to subterranean waters that emanate as geysers and fumaroles and mud pots and colorful hot springs, all penetrating the surface like whistles on a great calliope. Gradually the plateau’s forests regrew, its animal populations recolonized. -----> continue series @michaelnicknichols
Writing by David Quammen (@davidquammen)

YELLOWSTONE the battle for the american west
May 2016 National Geographic magazine

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