Geologic Time Scale

1. Geologic Time Scale

2. Warm-Up • Update your Table of Contents for today’s activities • Get your Argumentative Writing Prompt out to be checked • Using pages A63 – A64 in your science book complete the “Divisions of Time Section” on your note guide

3. Review • What did you decide was more useful…tree rings or ice cores? • Why?

4. Geologic Time Scale • Geologic Time Scale – a timeline of Earth’s History divided into periods of time by major events or changes on Earth What do we call these major events or changes?

5. Catastrophic Events Catastrophic Events – events that cause major destruction or change life completely Examples: • Mass extinctions • Ice Ages • Meteors • Major volcanic eruptions

6. EONS – largest division of timeEons of Time: • 1. Hadean • 2. Archean • 3. Proterozoic • 4. Phanerozoic • 1-3 make up Precambrian Time

7. PRECAMBRIAN TIME AMOUNT OF TIME: • 90% of Earth’s history • Lasted nearly 4 billion years of Earth’s 4.6 billion year total MAIN EVENTS: • Volcanic ash & dust ->clouds formed ->rain • Single-celled micro-organisms in ocean towards the end • NO animals! • NO plants!

8. Phanerozoic Eon – 544 million years ago – present day • Explosion of Life! • Contains 3 Eras: • Paleozoic Era – “Age of Amphibians” • Mesozoic Era – “Age of Dinosaurs” • Cenozoic Era – “Age of Mammals”

9. Paleozoic Era = “Ancient” 544 mya – 248 mya • All life in ocean until end • Fish developed • Reptiles, Insects, Ferns developed –> life moving onto land towards end • Ends with a Mass Extinction possibly from a meteor strike (???) – kills 90% of all ocean species!

10. Mesozoic Era = “Middle” 248 mya – 65 mya • Dinosaurs Rule! • Small mammals, birds, and flowering plants • Ends with Mass Extinction due to meteor strike off Mexico • Dust cloud blocked sunlight, killed plant life and affected food chain

11. Cenozoic Era =“Recent” 65 mya – Present • Large warm-blooded mammals, modernbirds • Animals developed migration techniques • Quaternary Period = the past 2 million yrs • Ice ages • 1st modern human fossils = 100,000 yrs old

13. After the Quiz – Children's Book • You will be creating a miniature children’s book to tell the story of Geologic Time in a child friendly way • You must include the entire story from your note guide and of course illustrations including a decorative cover and creative title

14. Example… Once upon a time, 4.6 billion years ago, the Earth was born. The world looked very different than it does today! At first, there weren’t even any plants and animals, and certainly no humans…can you imagine? And then…

15. It was Vocab Quiz Time! • When you are done, flip your quiz over and we will correct it the last few minutes of class • Work on your Children’s Book!

16. Warm-Up • Update your Table of Contents for today’s activities • Put your vocabulary quiz into your data folder • Using page A63 in your science book complete the “Earth’s History Timeline”

17. Clock of Eras Answers

18. Clock of Eras Label each era on the clock: • What do you notice?

19. Geologic Time Scale Notes Review • Get your note guide from last class out! • Life goes from simple to more complex • Most life occurs towards the end of the scale

20. Human Geologic Timeline • You will receive a slip of paper with an event from the Geologic Time Scale • First you must decide which of the 4 corners you belong – Check your note guide! • And then you must put yourselves in order within your era

21. Geologic Time Scale Order Precambrian Time • Earth formed (4.6 billion years ago) • Clouds formed (3 billion years ago) • Bacteria (3 billion years ago) • Single-celled organisms (3 billion years ago) • Blue-green algae (1 billion years ago) Remember: This is 90% of Earth’s History!

22. Geologic Time Scale Order Phanerozoic Eon – Paleozoic Era • Jellyfish & Sponges (600 million years ago) • Fish (480 million years ago) • Ferns (470 million years ago) • Sharks (400 million years ago) • Spiders (400 million years ago) • Reptiles (320 million years ago) • Flying insects (315 million years ago) • ENDED WITH….?

23. Geologic Time Scale Order Phanerozoic Eon – Mesozoic Era • Pangaea forms (240 million years ago) • First mammal (220 million years ago) • First bird (155 million years ago) • Flowering plants (120 million years ago) • Dinosaurs (75 million years ago) ENDED WITH…?

24. Geologic Time Scale Order Phanerozoic Eon – Cenozoic Era • Horses (55 million years ago) • Whales (52 million years ago) • Dogs (37 million years ago) • Cats (25 million years ago) • Mammoths & Elephants (5 million years ago) • Ice Ages in North America (1 million years ago) • Neanderthal man (0.5 million years ago) • First modern man (0.09 million years ago)

25. Work on Your Children’s Book • Your children’s book is to tell the story of Geologic Time in a child friendly way • You must include the entire story from your note guide and of course illustrations including a decorative cover and creative title

26. Homework • Complete your study guide for next class! • We will have a review day on Thursday and Friday will be the test (Yes, I am canceling Social Studies on Friday)