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* Stratigraphy Stratigraphy is the study of rock layers (strata) and their relationship with other other.

A process called relative-age dating helps scientists determine how old these rock layers are.

Thus if we observed rock layers that are folded or inclined, they must, with exceptions, have been moved into that position by crustal disturbances sometime after their deposition.

Principle of superposition The principle states that in an undeformed sequence of sedimentary rocks, each bed is older than the one above and younger than the one below.

Lecture 10 Stratigraphy and Geologic Time * Stratigraphy * Basic principles of relative age dating * Unconformities: Markers of missing time * Correlation of rock units * Absolute dating * Geologic Time How old is the Earth? Interpreting Earth history is a prime goal of geology.

Some knowledge of Earth history and geologic time is also required for engineers in order to understand relationships between geologic units and their impact on engineering construction.

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