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24 Cards in this Set
- Front
- Back
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What are the four Eons
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PreCamberian: Hadean, Archean, Proterozoic and Current: Phanerozoic
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What are the three eras of the Phanerzoic
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Paleozoic (early life), Mesozoic (middle life) and Cenozoic (modern life)
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How old is the earth
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4.5 billion years old
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What is absolute age dating
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Isotopic methods (radioactive dating, halflifes)
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What is relative age dating
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dating using superposition
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superpostion
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in a sequemce of sedimentary layers, the oldest is at the bottom and newer is on top.
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unconformity
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a missing part of the geological record caused by erosion and then more sedimetatio
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angular unconformity
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a titled uplift that is covered by horizontal layers
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disconformity
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horizontal layers with mising layers in the middle
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nonconformity
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sedimetary layers that are on top of igneous or metamorphic layers.
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What is isostasy or isostatic equilibrium
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Greek for equal, standig - a downward force must be balanced by an equal upward force somewhere beneath the mountains
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What causes esostatic uplift
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upward force from below is exceeds the weight of the moutains up above.
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/What are faults
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a break between two blocks of rock, along which two blocks slide relative to one another - brittle deformatio of a portion of the crust.
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What is ductile motion
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flowing slowly rather than breaking
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What is a normal fault
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where the hanging wall moved downward relative to the foot wall
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What is a reverse fault
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where the hanging wall moved upward relative to the foot wall
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What is a turst fault
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where the fault surface slopes at a low angle
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What is a strike-slip fault
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where one bolck slids laterally past the other
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what are folds
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the bending of rock layers
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What is a normal fault
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where the hanging wall moved downward relative to the foot wall
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What is a reverse fault
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where the hanging wall moved upward relative to the foot wall
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What is a thrust fault
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where the fault surface slopes at a low angle
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What is a strike-slip fault
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where one bolck slids laterally past the other
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what are folds
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the bending of rock layers
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