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intro_to_geo_20-1

intro_to_geo_20-1 - Geologic time relative/absolute age...

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Geologic time, relative/absolute age Relative age Relative age is a statement of ordinal timing Represented by the names of eras, periods, etc. The source of most names derives from the fossil content of sedimentary rocks For example, Ordovician sedimentary rocks were deposited after those of the Cambrian, but before those of the Silurian Numerical (absolute) age Numerical age for a rock is a number estimating the time of the rock’s formation in years before the present numerical ages for boundaries on the time scale require radiometric dates for igneous (and some metaigneous) rocks combined with the observation of spatial relationships between these rocks and sedimentary strata Relative age principles Principles used to interpret the order of events (i.e., relative age) that produced a sequence of rock: Steno’s original continuity Original horizontality Superposition Cross-cutting relationships Baked contacts Inclusions Fossil succession
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