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Description
This was from the trip to Mono Lake in 2013. Devil's Postpile National Monument. It was formed when a basalt lava cooled in a peculiar way. The phenomenon is called columnar jointing, where the lava cools into these hexagonal pillars.

Description
This was from the trip to Mono Lake in 2013. Devil's Postpile National Monument. It was formed when a basalt lava cooled in a peculiar way. The phenomenon is called columnar jointing, where the lava cools into these hexagonal pillars.