The study of the succession of fossils and its application to relative dating is known as ""biostratigraphy"". Each increment of time in the stratigraphy could be characterized by a particular assemblage of fossil organisms, formally termed a biostratigraphic ""zone"" by the German paleontologists Friedrich Quenstedt and Albert Oppel.
These zones could job speed dating erfurt be traced over large regions, and eventually globally. Groups of zones were used to establish larger intervals of stratigraphy, known as geologic ""stages"" and geologic ""systems"".
The time corresponding to most of these intervals of rock became known as geologic ""ages"" and ""periods"", respectively. By the end of the s, most of the presently-used geologic periods had been established based on their fossil content and their observed relative position in the stratigraphy e.
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