Looking up at the Moon in the night sky, you would never imagine that it is slowly moving away from Earth.
Cliff exposures atshow how layers of reddish-brown iron formation just under a meter thick are alternated, at regular intervals, by darker, thinner horizons.
The darker intervals are composed of a softer type of rock which is more susceptible to erosion. A closer look at the outcrops reveals the presence of an additionally regular, smaller-scale variation. Rock surfaces, which have been polished by seasonal river water running through the gorge, uncover a pattern of alternating white, reddish, and blueish-grey layers.. He suggested that the patterns might be related to past variations in climate induced by the so-called"Milankovitch cycles.
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