The Geological Time Scale - PowerPoint PPT Presentation

1 / 24
About This Presentation
Title:

The Geological Time Scale

Description:

... years only to be replaced by other species better adapted to changing conditions. ... It was only in existence for a short period of time ... – PowerPoint PPT presentation

Number of Views:359
Avg rating:3.0/5.0
Slides: 25
Provided by: Owne1425
Category:

less

Transcript and Presenter's Notes

Title: The Geological Time Scale


1
The Geological Time Scale
2
Geological Time Scale
  • The Earth is about 4.6 billion years old
  • Since then Earth has experienced continuous
    change
  • Some changes occur quickly, like volcanoes,
    earthquakes and floods, while others occur so
    slowly we can barely notice them, like erosion,
    and moving continents.

3
Geological Time Scale
  • To make the age of the Earth more understandable
    geologists have designed the Geological Time
    Scale, which breaks the 4.6 billion years into
    smaller portions.

4
(No Transcript)
5
Geological Time Scale
  • As the Earth changes so do the organisms that
    live on it.
  • Species have developed through time and changed
    as their environment changed.
  • Others have dominated the planet for millions of
    years only to be replaced by other species better
    adapted to changing conditions.

6
For example...
7
But what really killed them?
8
(No Transcript)
9
(No Transcript)
10
(No Transcript)
11
Earths Timeline
12
Earths Timeline
13
Earths Timeline
14
Earths Timeline
15
  • This might help

16
Geological Time Scale
  • Mass extinctions have occurred several times in
    Earths history
  • Dinosaurs died about 65 mya
  • 250 mya 96 of marine animals and 75 of land
    animals were wiped out
  • After every major extinction there is an
    opportunity for different species to become
    dominant

17
The Principle of Faunal Succession
  • This principle states that species change in form
    through time.
  • Each form is different from those that come
    before and after
  • From the fossils they find geologists use this
    principle to tell the order of layers in a rock
    sequence

18
The Evolution of the Horse
19
Index Fossils
  • These are fossils that can help tell the age of
    the rock layer it is found in.

20
Index Fossils
  • These are fossils that can help tell the age of
    the rock layer it is found in.
  • The Three Characteristics of an Index Fossil

21
Index Fossils
  • These are fossils that can help tell the age of
    the rock layer it is found in.
  • The Three Characteristics of an Index Fossil
  • Its easy to recognize
  • It was only in existence for a short period of
    time
  • It is found in many locations around the world

22
Trilobite
  • The layer you find this fossil in is 540 myo

23
(No Transcript)
24
Earliest multicellular life?
Write a Comment
User Comments (0)
About PowerShow.com