EESA06H3 Lecture Notes - Proterozoic, Radiometric Dating, Archean

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24 Oct 2012
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Lyell referred to hutton"s concept that geologic processes operating at present are the same processes that operated in the past as the principle of uniformitarianism. Dating based on radioactivity, allows us to determine a rock"s numerical age (absolute age) in years or other units of time. Geologists working in the field or in labs with maps, are more concerned with relative time, the sequence in which events took place. Contacts are the surfaces separating two different rock types or rocks of different ages. (useful for finding geologic history of an area) Four basic principles to determine relationship of geologic events: original horizontality- states that beds of sediment deposited in water formed as horizontal or nearly horizontal layers. Superposition- states that within a sequence of undisturbed sedimentary or volcanic rocks the layers get younger going from bottom to top. Later continuity- states that an original sedimentary layer extends laterally until it tapers or thins at its edges.

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