Geologic Time - Kean University

Geologic TimeIntroductionRelative TimeGeologic time ScaleNumerical TimeRates of ChangeSummaryAll things in nature work silently. They come into being and possessnothing. They fulfill their function and make no claim. All things alike dotheir work, and then we see them subside. When they have reached theirbloom, each returns to its origin .. This reversion is an eternal law. Toknow that law is eye of the trilobite tells us that the sun shone on the old beach wherehe lived; for there is nothing in nature without a purpose, and when socomplicated an organ was made to receive the light, there must have beenlight to enter Agassiz2 Introduction The concept of time scales measured in billions of years iscentral to our understanding of Geologic processes. Deep time corresponds to the bulk of the history of Earth,before fossils became abundant. The building blocks for life - water, heat, chemicalelements - were all present nearly four billion years ago,soon after Earth had formed.

5 geologic processes operate on a range of time scales measured from seconds to hundreds of millions of years. Relative Time • Three simple rules, the principles of superposition, cross- cutting relationships, and original horizontality, can be

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