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Learn about... Strata

Strata (singular stratum) are layers of rock laid down over time. They can be observed in cliff faces or other exposures as bands of different coloured rocks. Studying different strata is important because they tell us about the age of fossils and conditions at various times in the earth's history.

The Grand Canyon is a fine place to observe these layers. Those at the bottom of the canyon were laid down first, and successive layers have built up on top. This means that as you look down the side of the canyon, you see rocks of an increasing age.

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