On the way back from my weekend in Boise, we stopped at Craters of the Moon, National Monument. Craters of the moon is an extensive series of basalt flows produced by a fissure eruption -part of the Snake River Plain volcanics. The flow is fairly recent, in a geological sense: 8 eruptive events over the past 15,000 years. The basalt flows of Craters of the Moon differ from other extrusive snake rvier plain volcanics in compositional and textural variety. It's an impressive sight -especially as you drive through and realize the extent of the flows (It's quite large).
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