Wednesday, December 2, 2015

Cross Bedding

The pattern of the sandstone in this image indicates that the formation was composed of ancient sand dunes. The theory is that the sand dunes became frozen in place when they were cemented by water with a high concentration of calcium. The different patterns in the rock were caused by changes in the pattern of the winds. The vertical lines come from the stresses imposed on the rocks as they were uplifted to their present level.

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