1. Geological Time Scale
What time is it?

2. The Earth Is about 4.65 billion years old
Paleontologists created a geological time scale to represent evolutionary time.
This scale was developed based off of rock layers and fossils

3. How do you get a new era?
Major changes in rock formation or fossils of animals and plants mark a new era

4. The Earth’s age This Geological time scale is divided into: Eras
Which is divide into:
Periods

5. The Geological Clock
Each hour on the clock represents about 375 million years!

6. Time Machine Lets go back in time!!!
Today we will be taking a trip back in time through the Eras and discovering what life was like back then.
Lets go back in time!!!

7. Time Machine Mission: Reveal atmospheric conditions
Discover the animals that roamed the earth.
Compare marine and terrestrial organisms.
Most importantly…
What was here first?
Not Me!!

8. Precambrian (Proterozoic)
88% of Earth’s history billion yrs. ago
Soft bodied, single celled organisms (bacteria)
Photosynthetic algae which added oxygen to the atmosphere
Fossils evidence is scarce from this era. WHY?
We’re the 1st!
Bacteria Rule!

9. Color and Label the Era
Precambrian

10. Filling in the chart Era Time (yrs. ago) Organism Precambrian
1.7 billion
Soft bodied, single celled organisms
Bacteria/ algea

11. Paleozoic 544 Million yrs. ago
Marine animals with or without a backbone
Animals had hard parts: shells and outer skeletons
First plants appear in damp, low to the ground places
Ancestors of today’s jellyfish, worms, and sponges
Paleo- ancient or early
Trilobite
What do you see?

12. Paleozoic 544 Million yrs. ago
Ancestors of squid and octopi
First vertebrates (jawless fish)
First reptiles & sharks appeared
Animals moved on to land
Amphibian (water & land)
Mass extinction at the end of this era

13. Color and Label the Era
Paleozoic

14. Filling out the chart Era Time (yrs. ago) Organism Precambrian
1.7 billion
Soft bodied, single celled organisms
Bacteria/ algea
Paleozoic
544 million
Trilobite, jawless fish

15. Mesozoic 245 million yrs. ago
“Age of the Dinosaurs”
Cone bearing plants began to thrive
First flowering plants
Small Mammals
First birds
Turtles & crocodiles found in the seas
Another mass extinction/end of this era
Jurassic & Triassic Periods
Cycads
Meso- middle

16. Archaepteryx
Link from Reptile to Bird

17. Color and Label the Era
Mesozoic

18. Filling out the chart Era Time (yrs. ago) Organism Precambrian
1.7 billion
Soft bodied, single celled organisms
Bacteria/ algae
Paleozoic
544 million
Trilobite, jawless fish
Mesozoic
245 million
Dinosaurs, first flowers, first bird

19. Cenozoic 65 million yrs. ago
“Age of the Mammals”
Mammals adapted to live on land, water, and air
Dolphins, whales appeared
Grasses evolved
A series of ice ages changed the Earth’s climate
First Humans appeared (Homo sapiens)
Ceno- recent
Artie & Lucy

20. Color and Label the Era
Cenozoic

21. Filling out the chart Era Time (yrs. ago) Organism Precambrian
1.7 billion
Soft bodied, single celled organisms
Bacteria/ algae
Paleozoic
544 million
Trilobite, jawless fish
Mesozoic
245 million
Dinosaurs, first flowers, first bird
Cenozoic
65 million
Large mammals, 1st humans

22. Geographical Time Scale Review
The time scale is made up of 4 Eras:
1.Precambrian (yellow)
2. Paleozoic (blue)
3. Mesozoic (brown)
4. Cenozoic (green)
Mass Extinction=.

23. Where does the Evidence come from?
Paleontology-study of fossils
Fossils: remains or markings left by organisms that lived in the past

24. How do Fossils Form?
Water carries small rock particles to lakes & sea
Dead organisms are buried by layers of sediment, which forms new rock

25. Fossils 3 Main Types of Fossils: 1. Preserved 2. Petrification
At first I was afraid I was petrified…
3 Main Types of Fossils:
1. Preserved
2. Petrification
3. Traces

26. I. Preserved Organism Mummification- drying (deserts)
Amber- hardened tree sap
Tar Beds- petroleum ooze
Freezing- mammoths

27. I. Preserved Fossils: Freezing
Ötzi the Iceman, found in the Ötztal Alp
5,000 Years old
Austria and Italy border

28. II. Petrification
Petrification: organic material is replaced with minerals

29. III. Traces of organisms
Trace Fossils- footprints
Imprints- Leaves
Mold- retains shape of the organism
Cast- sand or mud fills the mold

30. III. Traces of organisms
Coprolites- animal droppings
Yes, it’s Dino Poo!

31. III. Traces of organisms
Gastroliths- digestive stones

32. Review Fossil Facts Can you name 4 types of Preserved Fossils?
Mummification
Amber
Tar Beds
Freezing

33. Review Fossil Facts
What’s the second type of Fossil?
Pertrification

34. Review Fossil Facts Name 6 types of Trace Fossils. Trace Fossils
Imprints
Mold
Cast
Coprolites
Gastroliths

35. Name That Era Lets Play…. Lets Play! Me first!!
I wanna play, pick me!!
Lets Play!
Me first!!

36. Which era had only sea life? 75 million points
Which era had many shell animals?
________
10 million points
Which era is the most recent?
_______
25 million points
In which era did flowering plants first grow?
Precambrian
Cenozoic
Paleozoic
Mesozoic