The principle of superposition says

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    all stratigraphic layers are horizontal
     all other factors being equal, older layers of strata are deposited first, then covered by newer layers
     certain fossil organisms can be used as a chronological index for strata
     stratigraphy may be used to arrive at absolute dates for geological events
asked Jun 29, 2012 in Anthropology by anonymous
    

1 Answer

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all other factors being equal, older layers of strata are deposited first, then covered by newer layers
answered Jun 30, 2012 by Bioshare ~Top Expert~ (34,070 points)

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