Sandstone rock strata. Patterns in crumpled strata revealed in eroded sandstone. Sandstone rock is a sedimentary rock, and forms by the deposition of successive layers of water-borne sediment that are later compressed into rock. These patterns formed by the combination of crumpling (from the movement of the Earth's crust) and erosion of the strata (layers). Photographed in Northumberland, UK.
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