Massacre Rocks: 3 Volcanic Episodes in 6 million Years
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Massacre Rocks is unique in that it contains volcanic rocks with different compositions, from three different vent areas. These include huge eruptions of a welded tuff of the Snake River Plain, the local Massacre Volcanic Center, and the Cedar Ridge basalt, which forms the cap rock, which was eroded to huge boulders by the Lake Bonneville Flood. And the area was on the Oregon Train and site of conflicts with Shoshoni warriors.