SandstoneThe rock itself is a sedimentary rock called sandstone. Sedimentary rock is made of large, compressed layers of sediments. One layer hardens into rock, and then another layer of sediments will fall and turn into new rock. This type of rock has inspired many of the hypotheses you can read about (under 'Formation' in drop down bar). Sandstone rock is generally a orange, red, or yellow rock. It is this rock that is so famous and clear in The Wave.
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