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en.wikipedia.org/wiki/Geologic_time_scale

[edit]. Life timeline ... Orange labels: known ice ages. ... Main articles: History of geology and ...

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

in Historical Perspective. What is the origin of the geologic time scale? The first people who needed to understand the geological relationships of different rock ...

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 ...

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 ... In addition to the relative dating of periods in Earth's history for which we ...

geology.com/time.htm

Printable Geologic Time Scale - Geologcial Time Line from Geology.com. ... Geologists have divided Earth's history into a series of time intervals. These time  ...

scienceviews.com/dinosaurs/geologictime.html

With this understanding geologists are able to determine the ages of rock relative to one another. By assembling all these layers together, scientists have worked ...

science.nationalgeographic.com/science/prehistoric-world/prehistoric-time-line

Humans have walked the Earth for 190,000 years, a mere blip in Earth's 4.5- billion-year history. A lot has happened in that time. Earth formed and oxygen levels ...

www.newworldencyclopedia.org/entry/Geologic_time_scale

Nicholas Steno laid down the principles underlying geologic time scales in the late seventeenth century.

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

The division of the geologic column into different periods is largely based upon the varieties of fossils found, taken as indicators of a time period in Earth's history  ...

geomaps.wr.usgs.gov/parks/gtime

Apr 25, 2017 ... What is Geologic Time? ... They had no way of knowing the ages of individual rock layers in years (radiometric dates), but they could often tell ...