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It is well-known that stratigraphy tries to arrange all rocks in chronological order according to their inorganic and organic characteristics and it attempts to produce a time scale to date geological processes and events. Therefore, it is at the heart of geology as a historical science.

Absolute radiometric dating delivers the framework of earth history and is the base of investigating the gross speed of processes like tectonic movements or organic evolution. However, up to now, only about 300 figures are available for the last 600 million years. Therefore, much refinement is needed by classical or new biostratigraphic methods, and by statistical conclusions from sediment thickness and sedimentation rates down to annual layers, paleomagnetic and other investigations.

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