Lecture 8 Geology 110

Earth Materials as Time Keepers

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

Why study the ages of rocks?

7.1 How do you determine the order of events?

7.1 How do you determine the order of events?

7.2 How are geologic events placed in relative order?

7.2 How are geologic events placed in relative order?

7.2 How are geologic events placed in relative order?

7.2 How are geologic events placed in relative order?

7.2 How are geologic events placed in relative order?

7.2 How are geologic events placed in relative order?

7.3 How do geologists determine the relative ages of rocks in widely separated places?

7.3 How do geologists determine the relative ages of rocks in widely separated places?

7.3 How do geologists determine the relative ages of rocks in widely separated places?

7.3 How do geologists determine the relative ages of rocks in widely separated places?

7.3 How do geologists determine the relative ages of rocks in widely separated places?

7.3 How do geologists determine the relative ages of rocks in widely separated places?

7.4 How was the geologic time scale constructed?

7.4 How was the geologic time scale constructed?

The Geologic Time Scale

7.4 How was the geologic time scale constructed?

7.4 How was the geologic time scale constructed?

7.5 How do you recognize gaps in the rock record?

7.5 How do you recognize gaps in the rock record?

7.5 How do you recognize gaps in the rock record?

7.5 How do you recognize gaps in the rock record?

7.6 How have scientists determined the age of Earth?

7.6 How have scientists determined the age of Earth?

7.6 How have scientists determined the age of Earth?

7.6 How have scientists determined the age of Earth?

7.6 How have scientists determined the age of Earth?

7.6 How have scientists determined the age of Earth?

7.6 How have scientists determined the age of Earth?

7.7 How is the absolute age of a rock determined?

7.7 How is the absolute age of a rock determined?

7.7 How is the absolute age of a rock determined?

Validating the method

Validating the method

Applying the method

7.7 How is the absolute age of a rock determined?

7.7 How is the absolute age of a rock determined?

Absolute and Relative Age Dating

Combining Absolute and Relative Age Dating

Age of Earth

7.7 How is the absolute age of a rock determined?

7.8 How do we know ... how to determine half-lives and decay rates?

7.8 How do we know ... how to determine half-lives and decay rates?

7.8 How do we know ... how to determine half-lives and decay rates?

7.9 How do you reconstruct geologic history with rocks?

7.9 How do you reconstruct geologic history with rocks?

Reconstructing Geologic History

Geologic History cross section

7.9 How do you reconstruct geologic history with rocks?