Lecture 5

Lecture 5 - Lecture 5 Geologic time, and Earth integrated...

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Lecture 5 Geologic time, and Earth integrated William Smith- Surveyor o 1794 began looking for canal roots, canals layered rock Aware of original horizontality and superposition and observed that fossils always occurs in a certain order B. Biostratigaphic correlation- layering of strata demonstrates timing of deposition o Layers are deposited in a predictable order, fossils are deposited in their respective layers o Keeping (relative) time with fossils works because the nature of evolutionary change, species are unique C. Building the geologic timescale- Some units are distinctive and have semi-global distribution o Carboniferous named from coal-bearing deposits of England and Wales, excellent plant fossils are found D. Radiometric age dating- Rate of decay of radioactive element o Parent (radioactive) decays producing daughter (stable or still radioactive) o Known rate of decay- measure amount of parent and daughter and calculate the time when the minerals crystallized o Known rates of radioactive decay of certain isotopes are well established and have
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Lecture 5 - Lecture 5 Geologic time, and Earth integrated...

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