Geochronology is the
science of determining the absolute age of
rocks,
fossils, and
sediments, within a certain degree of uncertainty inherent within the method used. A variety of dating methods are used by geologists to achieve this.Geochronology is different in application from
biostratigraphy, which is the science of assigning sedimentary rocks to a known geological period via describing, cataloguing and comparing fossil floral and faunal assemblages. Biostratigraphy does not directly provide an absolute age determination of a rock, merely places it within an interval of time at which that fossil assemblage is known to have coexisted.
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