1. How is geologic Time divided?

2.  I can distinguish the different geologic time periods.

3.  Tell me about last week…………… What science topics did we discuss?????????????

4.  Page 273  Geologic Time is divided into  Eon  Era  Period  epoch

5.  Eons are the longest subdivision on the geologic time scale.  Based on the abundance of certain fossils

6.  Era’s are the second longest subdivision  Marked by major, striking, worldwide changes in the types of fossils present.

7.  Periods are units of geologic time characterized by the types of life existing worldwide at that time.

8.  Epochs are 4 th on the geologic time scale for time.  Characterized by differences in life forms  Can vary from continent to continent Usually referred to as early, middle or late

9.  By the various rock layers and the fossils found in them.

10.  In your notes  Take about 7 minutes to draw the geologic time scale. (Page 273) you may color if time.

11.  Changes through time…(274)

12.  Species is a group of organisms that normally reproduces with only other members of their group.

13.  Natural Selections– a process by which organisms with characteristics that are suited to a certain environment have a better chance of surviving and reproducing than organisms without these characteristics.

14.  Chapter 10 section 1 read pages 272-279 (for understanding) Quiz tomorrow…..Reading/Comprehensi on quiz….  Exit Quiz

15.  1. How many different units is the geologic time scale divided into?  2. Name the different units of geologic time.