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To: Nevada9999 who wrote (5589)	1/30/2006 4:26:08 AM
From: E. Charters	Respond to of 78409

A few milliard eons ago, long before your socks were new, there was a great volcanic eruption/explosion in Kansas. This was before Dorothy met the Wiz even. But similar. The ash from this eruption blanketed the four surrounding states to a depth of a few feet. That is what I call phreatomagmatic. Une quelle tuff. Makes Mt. St. Helens or Pinatubo look like a piker. The marker formation is one of the largest in the Americas. In an active hotsprings area, there is sure to be a well of volcanic magma yearning to get to the surface. The analogue is in the Straits of Jaun de Fuca where contemporaneous sub aqueous springs are depositing copper, as logged by Franklin et al, of the GSC. The heat source is the same one roughly that gave rise to the Cascades smokers like St. Helens some 150 miles away in Washington. Someday, yes Yellowstone will erupt again, not just in water, but in massive billows of nuee-ardente ash, searing hot, embalming instantly everything in its fearful path. Afterwards the frozen hot and rock ash covered statues of la tourista, Pompei-like preserved for posterity, cameras in hand, will stand in mute, still testimony to the awesome power of nature. Yellowstone erupted 3580 cubic kilometres of rock some 600,000 years ago. In nearby Huckleberry Ridge, some 200 cubic kilometres was ejected about 2.2 million years ago. Pelee volcano.und.edu Krakatoa volcano.und.nodak.edu Novarupta volcano.und.edu en.wikipedia.org Mt. St. Helens fs.fed.us Yellowstone Hot Spot mac01.eps.pitt.edu "The Yellowstone caldera had its origin 600,000 years ago in a cataclysmic eruption that must have affected nearly the entire western half of the country. For about a half-million years previous to the eruption, a rhyolitic magma chamber below the caldera had given rise to viscous lava flows extruded through ring-like fractures that developed over the periphery of the chamber. Magma often has a considerable content of dissolved gases, mostly water vapor. Several kilometers beneath the Earth's surface, the gases remain dissolved in the magma: the pressure is too great to permit the existence of gas bubbles. But if something should occur to lower the ambient pressure below some critical value, then the volatiles begin to come out of solution to form bubbles. Table 4-1 Recent volcanic eruptions (modified EC<:-}