fascinating fossils a unison reading by alfredo, luis, jesus, gian, and marcos
TRANSCRIPT
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Fascinating Fossils
A Unison Reading by
Alfredo, Luis, Jesus, Gian, and Marcos
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[The group stops at the end of the first paragraph]Alfredo: Everyone understand this paragraph?Jesus: Yes, you?Alfredo: The dinosaur dies and is in the rock. Then the
people find the rock.Luis: Miss, he said it all!Jesus: The fossil people can know how the life changed.Luis: I understand that the dinosaurs died million years
ago and we can find them all over the world.Jesus: The bones.Gian: The animals, plants die, the life on Earth changed
through time.Alfredo: And at the museum we can see the fossils.
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Relative Dating
There are rules to relative dating. Here are the ones you need to know:
1) Law of Original Horizontality2) Law of Superposition3) Law of Cross-cutting Relationship4) Law of Included Fragments5) Unconformities
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Laws of Original Horizontality and Superposition
1) Layers are deposited horizontally
2) The oldest layer is on the bottom, the youngest layer is on the top
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Law of Superposition: The Pizza Rule
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Law of Superposition
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Law of Cross-Cutting Relationships
A fault or intrusion that goes through a rock layer is younger than that rock layer
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Law of Cross-Cutting Relationships: The Twinkie Rule
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Law of Cross-Cutting Relationships
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Law of Included Fragments
• A rock layer with pieces of another rock layer inside it is younger than the pieces
• Pieces of a rock layer inside another rock layer are older than the rock layer they are inside
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Law of Included Fragments: The Chocolate Chip Cookie Rule
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Unconformities
An unconformity can represent:– lost time–A tilting or
folding event
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