Introduction to the Geologic Time Chart (6:36)
Key Ideas
As this video progresses, key ideas will be introduced to invoke discussion.
Key Ideas
Think about the following questions as you watch the video
- 00:25 What is periodization?
- 01:12 Why does Professor Alvarez call periodization in history “informal” and periodization in geology “formal”?
- 01:42 What are the major divisions of time geologists use?
- 03:32 How does the rate of change compare in the four eons?
- 06:00 Professor Alvarez says that each period of geologic history has a personality that is familiar to all geologists. What is it that he likes about the Ordovician period?