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Relative dating of rocks worksheet

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A process called relative-age dating helps scientists determine how old these rock layers are.

The relative ages of rocks are important for understanding Earth’s history.

As the environment changes, living creatures adapt. They think about how long it took for those events to happen. The laws of stratigraphy can help scientists understand Earth’s past. Refer to the figure as you read about the laws below.

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.

For a fossil to be a good index fossil, it needs to have lived during one specific time period, be easy to identify and have been abundant and found in many places. If you find ammonites in a rock in the South Island and also in a rock in the North Island, you can say that both rocks are Mesozoic.

The way things happen now is the same way things happened in the past. Mountains grow and mountains slowly wear away, just as they did billions of years ago. They become extinct, meaning that they die out completely. They use clues from rocks and fossils to figure out the order of events.