intro_to_geo_21

intro_to_geo_21 - Geologic time relative/absolute age cont...

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Geologic time, relative/absolute age cont. Fossil succession and relative age Species originate within geologically brief time frames, few species persist for more than a few million years, and extinction is permanent Fossils that are, for example, uniquely found within Maastrichtian rocks can be used to illustrate temporal equivalence of isolated strata that bear these same fossil assemblages Thus, physically isolated sedimentary sequences can be temporally correlated in the absence of datable igneous intrusions Fossil succession Fossil succession allows relative ages to be produced for many fossiliferous sedimentary rocks regardless of their spatial contexts This allows for temporal correlation of widely separated strata on the basis of fossil content Overlap ranges (last origination–first extinction) for suites of long-ranging fossil species provide maximum constraint upon the ages of the strata that contain them Development of unconformity
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This note was uploaded on 04/08/2011 for the course GEOL 2001 taught by Professor Babaie during the Winter '09 term at UGA.

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intro_to_geo_21 - Geologic time relative/absolute age cont...

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