S.W. Colorado no stranger to volcanic activity

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S.W. Colorado no stranger to volcanic activity

Spiller Peak, like many peaks in the La Plata and San Juan Mountains, was formed when molten igneous rock pushed up through cracks in Earth’s crust. The crumbly rock on Spiller’s summit resulted from quick-cooling magma.

S.W. Colorado no stranger to volcanic activity

Spiller Peak, like many peaks in the La Plata and San Juan Mountains, was formed when molten igneous rock pushed up through cracks in Earth’s crust. The crumbly rock on Spiller’s summit resulted from quick-cooling magma.
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