Anth. 101 Notes 2

Anth. 101 Notes 2 - 4 Nov Dating Methods Module 2 & Ppt...

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Relative dates indicate which objects are older or younger in a given sequence. Numerical (“absolute”) dates identify how many years ago a rock layer was formed, a piece of clay was fired, or a living animal died. Paleoanthropologists and archaeologists ordinarily use as many dating methods as possible to assign reliable dates to the objects they recover. Biostratigraphic dating uses the fossils of widespread or rapidly evolving species to date the relative age of other fossils associated with them. Why? o Why widespread species ? They can act as “horizon” markers wherever they are found. o Why rapidly evolving species ? They can act as “clocks” because the changes that species underwent can show progressive change through time. Law of Superposition - A principle of geological interpretation stating that layers lower down in a sequence of strata must be older than the layers above them. Therefore, objects embedded in lower layers must be older than objects embedded in upper layers. Law of Crosscutting Relationships - A principle of geological interpretation stating that where old rocks are
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Anth. 101 Notes 2 - 4 Nov Dating Methods Module 2 & Ppt...

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