EARTH 119 Chapter Notes - Chapter 12: Stratigraphic Column, Geological Formation, Igneous Rock
7 Nov 2016
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Document Summary
Geologic time: the span of time since the formation of the earth. Fossils: the remnant, or trace, of an ancient living organism that has been preserved in rock or sediment. Relative age: the age of one geological feature with respect to another. Numerical age: the age of a feature given in years. Index fossils: the fossils of species that existed only for a short interval of the geologic column, and thus are diagnostic of a particular time interval. Unconformity: a boundary between two different rock sequences representing an interval of time during which new strata were not deposited and/or were eroded. Stratigraphic column: a cross-section diagram of a sequence or strata summarizing information about the sequence. Stratigraphic formations: a recognizable layer of a specific sedimentary rock type or set of rock types, deposited during a certain time interval, that can be traced over a broad region.
