Geologic time scale - Wikipedia, the free encyclopedia
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The geologic time scale is a chronologic schema (or idealized model) relating stratigraphy to time that is used by geologists, paleontologists and other earth scientists to describe the timing and r...
en.wikipedia.org/wiki/Geologic_time_scale
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List of time periods - Wikipedia, the free encyclopedia
The categorization of time into discrete named blocks is called periodization. This is a list of such named time periods as defined in various fields of study. Major categorization systems include ...
en.wikipedia.org/wiki/List_of_time_periods
Explore a specific period of time that interests you. ... Learn about the history of the geologic time scale. ... Visit our exhibit on plate tectonics, an important geological concept in any time period...
www.ucmp.berkeley.edu/exhibits/geologictime.php www.ucmp.berkeley.edu/exhibits/geologictime.php
The age of Earth is so long compared to all periods of time that we humans are familiar with, it has been given a special name: Geologic time.
www.cotf.edu/ete/modules/msese/earthsysflr/geotime.html
GEOLOGIC EONS, ERAS and PERIODS - Dinosaur glossary explains basic paleontological terms. ... 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 form an Eon, the largest division of geologic time.
www.enchantedlearning.com/subjects/dinosaurs/glossary/P... www.enchantedlearning.com/subjects/dinosaurs/glossary/Period.shtml
; PERIOD; The period is the basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years. ... ; EPOCH; An epoch is a division of a geologic period; it is the smallest division of geologic time, lasting several million years.
www.enchantedlearning.com/subjects/dinosaurs/glossary/G... www.enchantedlearning.com/subjects/dinosaurs/glossary/Geologictimeperiods.shtml
NOTE: Ages and names used here are based on U.S. Geological Survey Fact Sheet 2007-3015, "Divisions of Geologic Time -- Major Chronostratigraphic and Geochronologic Units", March 2007, ... An era of geologic time from the beginning of the Tertiary period to the present. Its name is from Greek and means "new life."
vulcan.wr.usgs.gov/Glossary/geo_time_scale.html
Hutchinson encyclopedia article about Mississippian (geologic period). Mississippian (geologic period). Information about Mississippian (geologic period) in the Hutchinson encyclopedia. ... Mississippian (geologic period); Mississippian civilization; Mississippian civilization; Mississippian culture;
encyclopedia.farlex.com/Mississippian+(geologic+period) encyclopedia.farlex.com/Mississippian+(geologic+period)
Although geologists can easily establish relative ages of rocks based on the principles of stratigraphy, knowing how much time a geologic Eon, Era, Period, or Epoch represents is a more difficult problem without having knowledge of absolute ages of rocks.
www.tulane.edu/~sanelson/geol111/geotime.htm
The oldest record of Ohio’s geologic history is preserved in igneous and metamorphic rocks of this period. These rocks lie deep beneath the surface of Ohio. ... Ohio's Geologic Period...
www.ohiohistorycentral.org/entry.php?rec=1380
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