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15 Cards in this Set
- Front
- Back
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What are the principals of relative age dating? |
Superposition Original horizontality Cross cutting relationships Inclusions |
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Superposition |
Oldest rock layers in a sequence are located at the bottom and youngest are located at the top |
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Original horizontality |
Layers of sediment are generally deposited in a horizontal position on a flat surface |
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Cross cutting |
Younger feautures cut across old feautures |
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Inclusions |
Included fragments are older than the enclosing rock |
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What are the types of uncomformities |
Angular uncomformity Discomformity Noncomformity |
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Angular unconformity |
Seperates a sequence of tilted layers from the horizontal layers above |
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Noncomformity |
Seperates igneous and or metamorphic rocks from the sedimentary layers from the top |
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Disconformity |
Seperates sequences of parallel layers |
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Parent isotopes |
The unstable isotope that undergoes decay |
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Daughter isotopes |
The product of this decay (parent isotope) |
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The half life |
The time for half of the life of the unstable isotope |
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Radioactive decay |
Progresses along a decay chain |
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What are the four major eons |
Haedan: hell Archean-ancient Proterzoic: before life Phanerzoic: visible life |
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The phanerzoic era |
Paleozoic: ancient life Mesazoic: middle life Cenozoic: recent life |
