Dating of rock layers
Erosion may have worn away some of the rock, but layers on either side of eroded areas will still “match up.” Look at the Grand Canyon in Figure below. You can clearly see the same rock layers on opposite sides of the canyon.
The matching rock layers were deposited at the same time, so they are the same age.
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Hutton thought that the intermediate rock layers eroded away before the more recent rock layers were deposited.
The laws of stratigraphy are usually credited to a geologist from Denmark named Nicolas Steno. Superposition refers to the position of rock layers and their relative ages.
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