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13 Cards in this Set

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  • Back
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Law of Superpostion
The oldest rock is on the bottum adn the newest is on the top.
Old/ Young
Principle of original Horizontality
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.
Laying the right way.
Principle of Cross- Cutting relationships.
when a fault cuts throug and crystalizes, the fault is younger than the rock it intruded onto.
Unconformities
What are unconformities?
A gap in geologic records, Long peroids of time when deposition ceased, erosion removed formed rocks then depostion resumed.
erosion
Different types of unconformaities
Disconformity
Angular Unconformity
What are fossils:
Remaind or traces of prehistoric life. Time indicators
Animals have to get covered to get a good fossil.
Animals
Many differentmethods of fossils:
Petrified, Replacement, molds and casts, carbonization and impression.
Index fossils:
Fossils which are widespread geographically. Limited to a very short span of time.
Radiometric Dating
Absolute dating. This happens from radiometric dating or isotopes.
precambian
Algae
Paleozoic
Invertebrates
Trilobites
Fish
Mesozoic
Dinosaurs
Cenozoic
Mammals
Sloths
Sabor tooth tigers