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Lava Flows 
Lava flows come in a variety of styles depending upon the composition of erupted material. Two major categories of lava flow in Colorado are as basalt (magnesium and iron rich) flows and rhyolite (silica rich) flows. Below: Distribution of late Tertiary basalt flows.

Distribution of late Tertiary basalt flows
 Colorado Geological Survey 
Last Updated: 1/25/2013 8:38 AM 
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