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14 Cards in this Set

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relative dating
specify the age of one feature with respect to another( A is before B, B is before C)
absolute/numerical dating
age of feature given in years, duration of age
radiometric dating systems with long-lived decay
U-Pb, K-Ar are millions to billions of years in halflife
radiometric dating system with short-lived decay
14C is thousands of years in halflife
What rock types can / cannot be dated numerically (absolutely)?
sedimentary
What minerals are best for dating?
U: zircon, uranite
K: mica, feldspar, hornblende
TYPES OF UNCONFORMITIES
angular
tilted or folded rocks that have been eroded and layers are exposed
TYPES OF UNCONFORMITIES
nonconformity
sed rocks overlie basement(older intrusive igneous and/or metamorphic rocks)
TYPES OF UNCONFORMITIES
disconformity
unconformity parallel to two sed sequences it separates (time gap between layers)
What factors favor the production and preservation of fossils?
1 death in anoxic environment
2 rapid burial
3 presence of hard parts
4 lack of diagenesis or metamorphism
Death in anoxic (Oxygen free) environment
dies in oxygen rich environment, bacteria will digest carcass, in air skeleton weathers and turns to dust
rapid burial
in a depositional environment where sediments accumulate rapidly so can it be buried before eaten, rot, oxidized
presence of hard parts
Skeletons, shells, etc… because soft flesh decays much faster
Lack of diagenesis or metamorphism
D-changes that occur in a sed rock as a result of deep burial and subsequent reaction with groundwater. M-changes in rocks recrystallization and fabric as a result of shearing and changes in pressure and temperature