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lin murphy
Jan 24, 2009
Columnar jointing in basalt. North Table Mt, Golden, CO. Shown here are 2 flows of Shoshonite, a potassium-rich basalt, probably originating 5 miles north of Golden about 60 million years ago. One sees at Table Mt, spheroidal weathering, glassy-appearing cooling planes, and vesicles filled with white zeolite minerals.  

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