Yellowstone Volcanic History
The most recent volcanic activity consisted of rhyolitic lava flows that erupted approximately 70,000 years ago.
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“Geologist [I'm Climate Change]”
Since: Mar 07
#1 May 19, 2014
Now know that the last eruption 70,000 Bp was the pitchstone plateau rhyolite flow (not known before).
Also know (not in article) that the eruption was subglacial in response to doubling of the size of the laurentide ice cap following Toba supervolcano eruption (74,000Bp) with the impetus for eruption being the cooling & rigidity of the cap above the residual magma chamber & depression loading of ice on the NW sector of the caldera causing uplift of SE sector.
Result was a rather large zit event with magma being largely degassed rhyolite residual magma erupting under either ice or water.
Have a nice day: Ag
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