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en.wikipedia.org/wiki/Geologic_time_scale

The geologic time scale (GTS) is a system of chronological dating that relates geological strata ..... In 1841 John Phillips published the first global geologic time scale based on the types of fossils found in each era. Phillips' scale helped ...

www.mcz.harvard.edu/Departments/InvertPaleo/Trenton/Intro/GeologyPage/Geologic%20Setting/geologictime.htm

The Modern Geologic Time Scale, as shown above, documents intervals of geologic ... the absolute ages of the rocks on which the relative time scale is based.

www.ucmp.berkeley.edu/exhibit/histgeoscale.html

What is the origin of the geologic time scale? The first people who needed to ... Growth of a prehistoric time scale: based on organic evolution. Revised edition ...

www.ucmp.berkeley.edu/help/timeform.php

Online exhibits. Geologic time scale. Take a journey back through the history of the Earth — jump to a specific time period using the time scale below and ...

geology.com/time.htm

Geologic time scale with a linear time axis. This time scale is available as a printable .pdf document. You can download this printable time scale and make ...

www.dummies.com/education/science/the-geologic-timescale

By Alecia M. Spooner. Part of Geology For Dummies Cheat Sheet. Geologists organize the 4.6 billion years of earth's history into sections based on important ...

hyperphysics.phy-astr.gsu.edu/hbase/Geophys/geotime.html

The vast expanse of geological time has been separated into eras, periods, and ... The named divisions of time are for the most part based on fossil evidence ...

www.ck12.org/book/CK-12-Earth-Science-Concepts-For-High-School/section/11.7

The geologic time scale is based on relative ages. No actual ages were placed on the original time scale. In what eon, era, period and epoch do we now live?

www.newworldencyclopedia.org/entry/Geologic_timescale

Apr 21, 2015 ... Based on radiometric dating techniques, the Earth is estimated to be about 4,570 million years (4570 "Ma") old. The geological time scale is a ...