Lecture 8 Geology 110
Table of Contents
- 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?
Text and Images from Slide
7.6 How have scientists determined the age of Earth?
- How long would it take Earth to cool?
- Physicist William Thomson (aka Lord Kelvin) attempted to calculate Earth's age based on knowledge of cooling rates from an original molten mass of ~1200o to 3870oC
Fig 7.14
Lord Kelvin's conceptual model gave an age of 20 to 40 million years. Others still disagreed, like paleontologist Thomas Huxley who argued this was still too young, using the "garbage in, garbage out" argument.