1. Foothill High School Science Department The History of Life Evolution of Multicellular Life

2. Foothill High School Science Department The Fossil Record Documents Documents – Evolutionary Histories – Climate – Geography – Life Forms

3. Foothill High School Science Department Precambrian Time Covers 90% of Earths History Covers 90% of Earths History During This Period: During This Period: – Simple Anaerobic Life Formed – Then Photosynthetic Organisms Released Oxygen Released Oxygen – Aerobic Life Formed – Eukaryotes Developed – Multicellular Organisms Appeared Start Finish

4. Foothill High School Science Department Cambrian Period Cambrian Explosion Cambrian Explosion – Huge Numbers of Multicellular Life Forms Developed – Shells, Outer Skeletons, Appeared – Trilobites, Brachiopods, Invertebrates Arrived – Burgess Shale in British Columbia is a famous fossil site for this event Burgess Shale Burgess Shale

5. Foothill High School Science Department Paleozoic Era Key Concept: Early In The Paleozoic Era, The Fossil Record Became Rich With Evidence of Many Types of Marine Life Paleozoic Weblink Paleozoic Weblink Age of the Trilobites

6. Foothill High School Science Department Ordovician & Silurian Periods First Appearance of: First Appearance of: – Octopus, Squid – Aquatic Arthropods – Vertebrate Jawless Fishes (suckers) Jawless Fishes (suckers) – Insects – Plants

7. Foothill High School Science Department Devonian Period Ferns Appear Fish Proliferate Sharks Appear Amphibians Evolve

8. Foothill High School Science Department Devonian Period Key Concept: During The Devonian, Animals Began To Invade Land Land

9. Foothill High School Science Department Carboniferous & Permian Periods Life Expands Across The Continents – Reptiles – Winged Insects Dragonflies, Cockroaches – Giant Ferns, Swampy Forests Laid Down Coal Deposits

10. Foothill High School Science Department Carboniferous & Permian Periods Key Concept: The Mass Extinction At The End Of The Paleozoic Affected Both Plants & Animals On Land & In The Seas. 95% Of Complex Ocean Life Forms Disappears

11. Foothill High School Science Department Permian Extinction Killed Off Killed Off – Trilobites – Many Amphibians What Survived What Survived – Most Fishes – Numerous Reptiles Extinction Link

12. Foothill High School Science Department Mesozoic Era Key Concept: Events During The 180 Million Years Of The Mesozoic Era Include The Increasing Dominance Of Dinosaurs. The Mesozoic Is Marked By The Appearance Of Flowering Plants

13. Foothill High School Science Department Mesozoic Era

14. Foothill High School Science Department Triassic Period Made Up Of The Organisms That Survived The Permian Extinction Made Up Of The Organisms That Survived The Permian Extinction Cone Bearing Plants Appear Cone Bearing Plants Appear “AGE of REPTILES” “AGE of REPTILES”

15. Foothill High School Science Department Triassic Period Mammals Appear In The Late Triassic Mammals Appear In The Late Triassic – Small Shrewlike Organisms

16. Foothill High School Science Department Jurassic Period Dinosaurs Still Rule First Birds Appear Archaeopteryx

17. Foothill High School Science Department Cretaceous Period Dinosaurs Still Dominant Dinosaurs Still Dominant – T. rex Flying Reptiles Flying Reptiles – Became Extinct During Cretaceous Seas Contained Seas Contained – Turtles – Crocodiles – Plesiosaurs

18. Foothill High School Science Department Cretaceous Appearance of: Appearance of: – Leafy Trees – Shrubs – Small Flowering Plants True Seeds True Seeds Often Enclosed In Fruit Often Enclosed In Fruit

19. Foothill High School Science Department Cretaceous Extinction 65 Million Years Ago 65 Million Years Ago > 50% of All Plant & Animal Groups Wiped Out > 50% of All Plant & Animal Groups Wiped Out – Including ALL the Dinosaurs

20. Foothill High School Science Department Cenozoic Era The Age of Mammals Key Concept: During The Cenozoic, Mammals Evolved Adaptations That Allowed Them To Live In Various Environments – On Land, Water & Air.

21. Foothill High School Science Department Tertiary Period Climates Warm & Mild Climates Warm & Mild Whales & Dolphins Evolve Whales & Dolphins Evolve Grasses Evolve Grasses Evolve – Grazing Mammals Evolved Some Mammals & Birds Became Very Large Some Mammals & Birds Became Very Large

22. Foothill High School Science Department Tertiary Mammals

23. Foothill High School Science Department Quaternary Period Climate Cooled Climate Cooled – Several Ice Ages Occurred Sea Levels Dropped By Over 100 Meters (300 Feet) Sea Levels Dropped By Over 100 Meters (300 Feet) 20,000 Years Ago 20,000 Years Ago – Climate Warmed – Ice Packs Melted – Sea Level Returned

24. Foothill High School Science Department Ice Age

25. Foothill High School Science Department Quaternary Period 4.5 Million Years Ago 4.5 Million Years Ago – Our Primate Ancestors Evolved 100,000 Years Ago 100,000 Years Ago – Genus Homo Arose In Africa Migrated Across The World In A Series of Migrations Migrated Across The World In A Series of Migrations