Correlating Rock Strata Notes

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How do we determine geologic age?

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Presentation transcript:

Correlating Rock Strata Notes Aim: How do we correlate rocks?

Correlation Geologists try to match similar rock strata in different locations to see if they formed at the same time. This process is called Correlation Lets learn about correlation

Several Correlation Methods Correlation by Continuity- “walking the outcrop” matching up rock layers that appear to be the same type and thickness. Comparing Properties- checking the color, composition and texture of rock strata to make sure they’re the same.

Several Correlation Methods 3. Volcanic Markers- volcanic eruptions leave a layer of ash in a wide area over a short period of time.

Several Correlation Methods 4. Index Fossils- the remains of organisms that lived for a short time, but lived all over the Earth. Example- Humans will be an excellent index fossil.

Which fossil is a good index fossil? Correlating Rocks Which fossil is a good index fossil?

It is found in only one layer but in multiple outcrops. Index Fossil? It is found in only one layer but in multiple outcrops.