Both disciplines work together hand in hand however, to the point where they share the same system of naming rock layers and the time spans utilized to classify layers within a stratum.
By combining multiple geochronological (and biostratigraphic) indicators the precision of the recovered age can be improved.Genetic evolution is vertical and chronological, whereas cultural evolution can be horizontal and can move backwards as well as forwards.D.3.10 Discuss the relative importance of genetic and cultural evolution in the recent evolution of humans.The rate of decay (half-life) is different for different radioisotopes.C-14 and K-40 are the two radioisotopes most commonly used.In K-40 dating the proportions of K-40 atoms to Ar-40 atoms is measured.The half-life of K-40 is 1.26 billion years so it is useful for dating samples over 100,000- 1 million years old. The time it takes for the radioactivity to fall to half of its original level D.3.3 Deduce the approximate age of materials based on a simple decay curve for a radioisotope.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, but merely places it within an interval of time at which that fossil assemblage is known to have coexisted.D.3.5 Outline the trends illustrated by the fossils of Ardipithecus ramidus, Australopithecus including A. There are few fossils of savanna- or forest-dwelling hominids.D.3.8 Discuss the correlation between the change in diet and increase in brain size during hominid evolution. Change in diet from mostly vegetarian to more omnivorous diets corresponds to the increase in brain size.