10F_n_time - Datinggeologicevents...

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Dating geologic events Relative dating  - sequence of events Absolute dating  - age numbers
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youngest oldest Sedimentary layers Basic principles of relative dating Law of superposition  - in an undeformed sequence, each layer is younger than  the one below  (for layers deposited at surface) Sea level
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Principle of original horizontality  -  sediments are generally deposited in  horizontal layers
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Principle of fossil succession   -  fossil organisms succeed one another in  a definite and determinable order, therefore any time period can be  recognized by its fossil content
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Principle of cross-cutting relationships  -  features that cut rocks (faults &  intrusive igneous rocks) must be younger than the rocks which they cut
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Absolute Time Isotopic or radiometric dating
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Structure of Atoms 3 types of particles in atoms Protons  (+ charge) Neutrons  (no charge) Electrons  (- charge) Protons & neutrons in  nucleus Electrons in  electron cloud  around nucleus
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10F_n_time - Datinggeologicevents...

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