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glacial striations on basalt columns - devils postpile (california)

glacial striations on basalt columns - devils postpile (california), california, columnar basalt, columns, devils postpile, eastern sierra, erosion, forest, geology, glacial polish, glacial striations, lava flow, rock formation, trees, volcanic

The top of the columns of Devils Postpile - Columnar Basalt in the Eastern Sierra (California)

A basalt volcanic flow formed hexagonal-shaped columns when it cooled down.

You can clearly see the parallel grooves showing the erosion caused by debris pushed by the slow-moving ice of the glacier that used to cover this valley. Those marks are called glacial striations.

For more info about this rock formation, go to en.wikipedia.org/wiki/Devils_Postpile_National_Monument.

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