Figure 5. Some of the beds display well-developed sedimentary structures, as in this image. Within the roughly parallel edges of the light-colored quartzite beds are thin dark lines arranged in waves. These were originally ripples on the bed surface when the sand was deposited, now seen in cross section. That such fine structures have survived millions of years and multiple episodes of heat and compression is remarkable.

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Last updated on January 28, 2008

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