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Home , Chronological dating, Date (metadata), Era (geology), Geologic time scale, Timeline, Week

Week 6: Geological Warmup: What is the geologic scale?

LT: I can explain how ’s geological is divided in the . Review: Geologic Time Scale Earth is very old!

- Estimated that earth is at least 4.5 billion old - It would take a long amount of time to categorize earth’s history into days, , or years...we needed a better way. - Scientists developed a way to categorize and explain earth’s history... GEOLOGICAL TIME Geologic Time Scale

Definition: A of that relates geological strata to time and is used by , paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during earth’s history.

An arrangement or sequence of events over time Go over Personal - What were some events you included on your timeline? What events do you remember best? - Why did you choose to include those events? - What evidence do you have that an happened when it did? Discussion Questions - What kind of information did you need to get in order to put the events in your in a sequence? - Were there some events you weren’t sure about where to place? Complete Timeline Question WS as a of 4! Focus on Item 5 on Personal Timeline

- : a period of time in history, starting at one and ending on another - Divide your timeline into “”... - Younger, Middle, Older - Before school, elementary school, middle school - Really fuzzy, fuzzy, remember it well The process we used to create our personal timeline is similar to the one scientists use to establish a sequence of events on earth!

Task: Read p. 76 -78 in text book...answer questions on p. 78 in your journal when you are done Discuss reading and answers to questions Warmup: Why is the geologic time scale important?

LT: I can explain the difference between relative and and I can create a conceptual model of the geologic time scale. Geological Time Scale Vocabulary

https://www.youtube.com/watch?v=r10oh1NHKv4

https://www.youtube.com/watch?v=j2r55qCPbDo Read p. 79 “popcorn ” as a class Geologic Time Scale Vocabulary Eon - Largest division of geologic time

Era - Broad spans of time based on the general type of life existing during that time

- Zoic = life - = ancient life - = middle life.... - = recent life... - Ends of eras are usually marked by a great extinction

Period - Shorter spans of time based on evidence of major disturbances in Earth’s crust and on the characteristics of the common formations

Epoch - Subdivisions of a periods

Relative Dating Dating of events or substances in comparison with one another, in chronological order...an ESTIMATE

Ex: Comparing different types of in rock layers gives us an ESTIMATE of how old something is...but how can we really tell?!

https://www.youtube.com/watch?v=phZeE7Att_s Absolute Dating

An estimate of the true of a or rock or based on the rate of decay of radioactive materials

Putting timeline in perspective: https://www.youtube.com/watch?v=0yBzxC9eoog Construct class geologic time scale Reflection Questions:

PLEASE ANSWER ALL QUESTIONS IN COMPLETE SENTENCES!

1. Write three sentences about what you learned when we made the class geologic time scale. 2. Write two questions you have about the geologic time scale and what it is used for. 3. Why do you think the geologic time scale is important? Warmup: List some of the different time divisions in the geologic time scale.

LT: I can put Grand rock samples in order on the geologic time scale. Make individual timeline

- Use timeline worksheet to make your timeline, include all the major parts on your timeline with dates - Make sure your timeline has a scale and labels! rocks on timeline

- Use the timeline worksheet and text books (if needed) to but the grand canyon rock samples in order on your personal timeline. Do BOTH Nankoweap and North Canyon - Write the rock numbers and names ON your timeline Warmup: Explain what we did in class...

LT: I can watch a video about Earth’s history and take notes on the main ideas. Story of Earth Video https://www.youtube.com/watch?v=HUSIOOnuw0U

Take notes during video on a piece of notebook paper.

After video:

- Write 1 paragraph (5 sentences) about what you learned. - Write 2 questions you have from the video

TURN in NOTES and PARAGRAPH/QUESTIONS to INBOX NO WARM UP! Turn in LT and Warm Up Sheet and get ready for your QUIZ!

LT: I can explain how fossils form and explain why they are important to study. Quiz 2 Fossils

What are fossils?

How are fossils discovered?

What do fossils tell us? Underground Astronauts https://www.youtube.com/watch?v=D9mXu1BWI6A

1. https://www.youtube.com/watch?v=Al3LuYnz5EI 2. https://www.youtube.com/watch?v=1_r3UnkjcL0