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13 Cards in this Set
- Front
- Back
- 3rd side (hint)
Law of Superpostion
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The oldest rock is on the bottum adn the newest is on the top.
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Old/ Young
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Principle of original Horizontality
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Layers of sediment are generally depsotied in a horizontal position. If observed layers are flat, it means they have not been disurbed. Still having their orig. Horizontality.
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Laying the right way.
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Principle of Cross- Cutting relationships.
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when a fault cuts throug and crystalizes, the fault is younger than the rock it intruded onto.
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Unconformities
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What are unconformities?
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A gap in geologic records, Long peroids of time when deposition ceased, erosion removed formed rocks then depostion resumed.
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erosion
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Different types of unconformaities
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Disconformity
Angular Unconformity |
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What are fossils:
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Remaind or traces of prehistoric life. Time indicators
Animals have to get covered to get a good fossil. |
Animals
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Many differentmethods of fossils:
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Petrified, Replacement, molds and casts, carbonization and impression.
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Index fossils:
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Fossils which are widespread geographically. Limited to a very short span of time.
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Radiometric Dating
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Absolute dating. This happens from radiometric dating or isotopes.
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precambian
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Algae
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Paleozoic
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Invertebrates
Trilobites Fish |
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Mesozoic
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Dinosaurs
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Cenozoic
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Mammals
Sloths Sabor tooth tigers |
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