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en.wikipedia.org/wiki/Geologic_time_scale

Early work on developing the geologic time scale ... and the names of the geologic periods reflect ...

en.wikipedia.org/wiki/Period_(geology)

A geologic period is one of several subdivisions of geologic time enabling cross- referencing of rocks and geologic events from place to place. These periods ...

www.fossils-facts-and-finds.com/geologic-time.html

In the early 1800's a system for naming geologic time periods was devised using four periods of geologic time. They were named using Latin root words, Primary ...

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 ...

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

The vast expanse of geological time has been separated into eras, periods, and epochs. The numbers included below refer to the beginnings of the division in ...

www.enchantedlearning.com/subjects/dinosaurs/glossary/Period.shtml

The period is the basic unit of geological time in which a single type of rock system is formed. Two or more periods comprise a geological Era. Two or more Eras ...

www.infoplease.com/science-health/physical-science/table-geological-periods

It is generally assumed that planets are formed by the accretion of gas and dust in a cosmic cloud, but there is no way of estimating the length of this process.

scienceviews.com/dinosaurs/geologictime.html

The Earth carries the history of geological events in its rock layers. It follows ... An era of geologic time from the beginning of the Tertiary period to the present.

geology.com/time.htm

Subdivision of periods into epochs can be done only for the most recent portion of the geologic time scale. This is because older rocks have been buried deeply,  ...