Relative dating of geological strata

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Seriation uses the assumption that once a tool was developed, its use would become more widespread.

Stratigraphy uses the assumption that higher layers or strata were laid down after lower layers.

The ten strata systems that compose the “standard geologic column” are the familiar Cambrian, Ordovician, Silurian, Devonian, Carboniferous, Permian, Triassic, Jurassic, Cretaceous, and Tertiary periods.

Although no absolute methods were available to establish actual dates, Lyell needed to assign very old dates to the strata to make them consistent with the long eons of time that would be necessary to meet the new uniformitarianism theory developed by James Hutton and himself.

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