The two main types of dating methods are relative and absolute.Relative dating methods are used to determine only if one sample is older or younger than another.The successive layers of rock represent successive intervals of time.Since certain species of animals existed on Earth at specific times in history, the fossils or remains of such animals embedded within those successive layers of rock also help scientists determine the age of the layers.Similarly, pollen grains released by seed-bearing plants became fossilized in rock layers.
Dating techniques are procedures used by scientists to determine the age of an object or a series of events.
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. 1979, 1986 © Harper Collins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012 Cite This Source (krə-nŏm'ĭ-tər) An extremely accurate clock or other timepiece.
Chronometers are used in scientific experiments, navigation, and astronomical observations.
Absolute dating methods are carried out in a laboratory.
The main relative dating method is stratigraphy (pronounced stra-TI-gra-fee), which is the study of layers of rocks or the objects embedded within those layers.
This method is based on the assumption (which nearly always holds true) that deeper layers of rock were deposited earlier in Earth's history, and thus are older than more shallow layers.