Question of the Day How can you use fossils to determine relative ages of rock layers? 179.

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Presentation transcript:

Question of the Day How can you use fossils to determine relative ages of rock layers? 179

Fossils Any remains, trace, or imprint of a living thing preserved in Earth’s crust. Most fossils are found in which rocks? Metamorphic Igneous Sedimentary

Then and Now

Correlation Matching up rocks or geologic events from different locations by similar age

Distributed over wide area Index Fossils Lived for short time Distributed over wide area Abundant Eurypterid

Key Beds Rock layer that is unique and easily recognizable. Deposited over a short time period Widespread Ex. Volcanic ash, meteorite deposits