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en.wikipedia.org/wiki/Geologic_time_scale

The geological time scale (GTS) is a system of chronological dating that relates geological ..... In 1841 John Phillips published the first global geological 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/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.

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 ...

pubs.usgs.gov/gip/geotime/relative.html

Jun 13, 2001 ... Therefore, the actual length of geologic time represented by any given ... time by dividing the Earth's history into Eras -- broad spans based on ...

geomaps.wr.usgs.gov/parks/gtime

Apr 25, 2017 ... What is Geologic Time? Concealed within the rocks that make up the Earth's crust lies evidence of over 4.5 billion years of time. The written ...

pubs.usgs.gov/fs/2007/3015/fs2007-3015.pdf

divisions of geologic time. A geologic time scale is composed of standard stratigraphic divisions based on rock sequences and calibrated in years (Harland and ...