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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 ...

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 ...

geology.com/usgs/geologic-time-scale

A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and is calibrated in years (Harland and others, 1982). Over the ...

geology.com/time.htm

Printable Geologic Time Scale - Geologcial Time Line from Geology.com.

www.newworldencyclopedia.org/entry/Geologic_time_scale

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 ...

www.library.arizona.edu/exhibits/swetc/azso/back.1_div.1.html

Geologic time correlates rocks and time. The modern geologic time scale shown in Figure A1 was nearly complete by the end of the 19th century and was based ...

www.earthsciweek.org/content/geological-time-scale

Geologic time is often dicussed in two forms: Relative time ("chronostratic") -- subdivisions of the Earth's geology in a specific order based upon relative age ...