GEOLOGIC TIME QUESTIONS



HONORS EARTH SCIENCE

GEOLOGIC TIME QUESTIONS NAME _______________

DATE ________ HOUR __

Use the geologic time scale (page 312) and pages 303-306 to answer the following:

1. Geologic time is divided into four large units of time called eras. List the 4 eras in order from oldest to most recent.

2. What era do we live in? _________________________ When did it start? ________

3. When did the Mesozoic era begin? ______________ When did it end? ____________

4. How long did the Mesozoic era last? _______________________

5. Which era lasted for the longest period of time? _________________

How long did it last?________________________

6. Why isn’t the Precambrian Era further subdivided into periods?

7. Time periods are shorter divisions of time than eras. Which period lasted the longest amount of time (do not consider the Precambrian a period, it is an era)? ____________

How long did it last? _____________

8. What is an epoch?

9. What is the meaning of each of the era’s names?

Paleozoic-

Mesozoic-

Cenozoic-

10. Which era do we have the most information about? Explain why.

11. Why would one geologic period (not era) end and another begin?

12. What is the problem with telling the age of sedimentary rocks?

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