The Geological Timescale
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Geologic Time Scale []
In 1699, Nicolaus Steno studied geologic principals and stated that sedimentary rock was laid down in a horizontal manner with younger rocks on top of the older rocks.
First geologic map of England was produced by William Smith in 1815. His contribution consisted of the basis that fossils were found in rocks in a very definitive order (seeIndex Fossils). This led others to identify fossils in a relative time scale. This time scale is divide up in portions based on hierarchy: Eons, Eras, Periods, Epochs, and Ages
http://www.ucmp.berkeley.edu/exhibit/histgeoscale.php[]
Kutschera, U., & Niklas, K. J. (2004). The modern theory of biological evolution: an expanded synthesis. Naturwissenschaften, 91(6), 255-276.
