How is geologic Time divided Bell Ringer I

How is geologic Time divided? Bell Ringer

I can distinguish the different geologic time periods.

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

Geologic Time Divisions Page 273 Geologic Time is divided into Eon Era Period epoch

Eon Eons are the longest subdivision on the geologic time scale. Based on the abundance of certain fossils

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

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

Epoch’s 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

How was geologic time divided? By the various rock layers and the fossils found in them.

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

Organic Evolution Changes through time…(274)

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

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.

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

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