Relative Dating I Relative Dating Relative Dating is
![Relative Dating Relative Dating](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-1.jpg)
![I. Relative Dating • Relative Dating is when you give the age of a I. Relative Dating • Relative Dating is when you give the age of a](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-2.jpg)
![II. Rules of Relative Dating 1. Law of Superposition: Superposition When sedimentary rock layers II. Rules of Relative Dating 1. Law of Superposition: Superposition When sedimentary rock layers](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-3.jpg)
![Rules of Relative Dating 2. Law of Original Horizontality: Horizontality Sedimentary rock layers are Rules of Relative Dating 2. Law of Original Horizontality: Horizontality Sedimentary rock layers are](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-4.jpg)
![Rules of Relative Dating 3. Law of Cross-Cutting Relationships: Relationships If an igneous intrusion Rules of Relative Dating 3. Law of Cross-Cutting Relationships: Relationships If an igneous intrusion](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-5.jpg)
![III. Correlation • Rock layers in different places and be correlated or matched up III. Correlation • Rock layers in different places and be correlated or matched up](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-6.jpg)
![IV. Unconformity • When rock has been eroded, eroded so you have a missing IV. Unconformity • When rock has been eroded, eroded so you have a missing](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-7.jpg)
![Unconformity Unconformity](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-8.jpg)
![Why are some of the layers tilted? What happened to the top of the Why are some of the layers tilted? What happened to the top of the](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-9.jpg)
![What type of rocks formed above? What events might have caused the rock layers What type of rocks formed above? What events might have caused the rock layers](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-10.jpg)
![Index Fossils • Some species of organisms only lived for a short period of Index Fossils • Some species of organisms only lived for a short period of](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-11.jpg)
![Graptolite • Index Fossil of the Ordovician Period • Age: 500 -335 mya Graptolite • Index Fossil of the Ordovician Period • Age: 500 -335 mya](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-12.jpg)
![Fossil B lived 10 million years ago – 2 million years ago. Fossil A Fossil B lived 10 million years ago – 2 million years ago. Fossil A](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-13.jpg)
![• What is “B”? • Place the layers in order from oldest to • What is “B”? • Place the layers in order from oldest to](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-14.jpg)
![Put the events in order Put the events in order](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-15.jpg)
![Put the events in order Put the events in order](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-16.jpg)
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- Slides: 21
![Relative Dating Relative Dating](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-1.jpg)
Relative Dating
![I Relative Dating Relative Dating is when you give the age of a I. Relative Dating • Relative Dating is when you give the age of a](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-2.jpg)
I. Relative Dating • Relative Dating is when you give the age of a rock or fossil compared to another rock or fossil. – Example: Rock A is OLDER than Rock B. – An actual age in years is not determined.
![II Rules of Relative Dating 1 Law of Superposition Superposition When sedimentary rock layers II. Rules of Relative Dating 1. Law of Superposition: Superposition When sedimentary rock layers](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-3.jpg)
II. Rules of Relative Dating 1. Law of Superposition: Superposition When sedimentary rock layers are deposited, younger layers are on top of older deposits.
![Rules of Relative Dating 2 Law of Original Horizontality Horizontality Sedimentary rock layers are Rules of Relative Dating 2. Law of Original Horizontality: Horizontality Sedimentary rock layers are](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-4.jpg)
Rules of Relative Dating 2. Law of Original Horizontality: Horizontality Sedimentary rock layers are deposited horizontally. If they are tilted, folded, or broken, it happened later.
![Rules of Relative Dating 3 Law of CrossCutting Relationships Relationships If an igneous intrusion Rules of Relative Dating 3. Law of Cross-Cutting Relationships: Relationships If an igneous intrusion](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-5.jpg)
Rules of Relative Dating 3. Law of Cross-Cutting Relationships: Relationships If an igneous intrusion or a fault cuts through existing rocks, the intrusion/fault is YOUNGER than the rock it cuts through
![III Correlation Rock layers in different places and be correlated or matched up III. Correlation • Rock layers in different places and be correlated or matched up](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-6.jpg)
III. Correlation • Rock layers in different places and be correlated or matched up by matching up the rocks and fossils in the layers.
![IV Unconformity When rock has been eroded eroded so you have a missing IV. Unconformity • When rock has been eroded, eroded so you have a missing](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-7.jpg)
IV. Unconformity • When rock has been eroded, eroded so you have a missing section of time in the rock record.
![Unconformity Unconformity](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-8.jpg)
Unconformity
![Why are some of the layers tilted What happened to the top of the Why are some of the layers tilted? What happened to the top of the](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-9.jpg)
Why are some of the layers tilted? What happened to the top of the folded rocks? The missing rock layers is called an _____.
![What type of rocks formed above What events might have caused the rock layers What type of rocks formed above? What events might have caused the rock layers](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-10.jpg)
What type of rocks formed above? What events might have caused the rock layers to become tilted? Why is the top flat? What caused the angular unconformity?
![Index Fossils Some species of organisms only lived for a short period of Index Fossils • Some species of organisms only lived for a short period of](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-11.jpg)
Index Fossils • Some species of organisms only lived for a short period of time before they became extinct. If you use radiometric dating to get Trilobite: Index fossil for the an age for the fossil, then you know that the rock the Paleozoic Era Age: 590 -250 mya fossil is found in is also that age.
![Graptolite Index Fossil of the Ordovician Period Age 500 335 mya Graptolite • Index Fossil of the Ordovician Period • Age: 500 -335 mya](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-12.jpg)
Graptolite • Index Fossil of the Ordovician Period • Age: 500 -335 mya
![Fossil B lived 10 million years ago 2 million years ago Fossil A Fossil B lived 10 million years ago – 2 million years ago. Fossil A](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-13.jpg)
Fossil B lived 10 million years ago – 2 million years ago. Fossil A lived 20 million years ago- 8 million years ago. What do you know about the age of the rock containing both fossils?
![What is B Place the layers in order from oldest to • What is “B”? • Place the layers in order from oldest to](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-14.jpg)
• What is “B”? • Place the layers in order from oldest to youngest
![Put the events in order Put the events in order](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-15.jpg)
Put the events in order
![Put the events in order Put the events in order](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-16.jpg)
Put the events in order
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![http reynolds asu eduglg 103relativeageprinciples htm http: //reynolds. asu. edu/glg 103/relative_age_principles. htm](https://slidetodoc.com/presentation_image_h2/17f767250f6e972b9a6c30edcbc2fa0c/image-21.jpg)
http: //reynolds. asu. edu/glg 103/relative_age_principles. htm
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Unconformity
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Relative age dating
Discomformities
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