Ch 17: Geologic Time Scale

About This Chapter

Study the earth's geological time scale with this chapter. These video lessons can help you improve your grades, study for exams, learn more about geology or earn continuing education credit.

Geologic Time Scale - Chapter Summary

This chapter covers the earth's geologic time scale and examines several subdivisions of the earth's existence. You'll compare and contrast two different theories regarding the earth's formation and find out what preserved fossils can tell us about time.

Each lesson comes with a multiple-choice quiz that's designed to help you check your understanding of geological concepts and definitions. Feel free to reach out to our instructors if you have any questions about the lesson material, and you can supplement your studying by printing out the convenient lesson transcripts. You can also quickly find the information you need using the easy-to-navigate Dashboard and interactive video timelines for each lesson. These bite-sized and engaging lessons are also available to access at any time, day or night, and you can study them using any computer or mobile device. This chapter teaches you things like:

  • The division of geological time, including major eons, eras, periods and epochs
  • The differences between the theories of catastrophism and uniformitarianism
  • How fossils are preserved
  • The ways index fossils indicate time

Chapter Practice Exam
Test your knowledge of this chapter with a 30 question practice chapter exam.
Not Taken
Practice Final Exam
Test your knowledge of the entire course with a 50 question practice final exam.
Not Taken

Earning College Credit

Did you know… We have over 200 college courses that prepare you to earn credit by exam that is accepted by over 1,500 colleges and universities. You can test out of the first two years of college and save thousands off your degree. Anyone can earn credit-by-exam regardless of age or education level.

To learn more, visit our Earning Credit Page

Transferring credit to the school of your choice

Not sure what college you want to attend yet? has thousands of articles about every imaginable degree, area of study and career path that can help you find the school that's right for you.