Geoscientists use a timescale to study the history of the Earth and its life. Download this wall chart of the Geological Timescale: 

Read about the changes to v 4.0 (2012): Commentary · GSA Bulletin Article ( Walker, et al. 2013). Education & Careers. GeoCareers · Geoscience Job Board. The principal chart shows the Phanerozoic (Cambrian to Quaternary) timescale. The names of the individual periods are links: each one leads to a more detailed   Oct 16, 2018 - Explore jcampbell2299's board "Geologic Time Scale" on Geologic time scale from 650 million years ago to Living Fossils Wall Chart. Geoscientists use a timescale to study the history of the Earth and its life. Download this wall chart of the Geological Timescale:  This beautiful tree of life chart is both a timeline of evolution and a guide to biological classification (domain, kingdom, phylum, order, family, and genus). E Cool 

You can download this printable time scale and make copies for personal use. Dividing Earth History into Time Intervals. Geologists have divided Earth's history  

gsa geologic time scale v. 5.0 cenozoic age epoch age picks magnetic polarity period hist. chro n. quater-nary pleistocene* miocene oligocene eocene paleocene pliocene piacenzian zanclean messinian tortonian serravallian langhian burdigalian aquitanian chattian rupelian priabonian bartonian lutetian ypresian danian thanetian selandian calabrian The geologic time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time.It is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth's history.The table of geologic time spans, presented here, agree with the nomenclature, dates and standard color codes set Chart Click here (PDF or JPG) to download the latest version (v2020/01) of the International Chronostratigraphic Chart. The explanatory article was published in September 2013 issue of Episodes (download from Episodes or ICS website). Dividing Earth History into Time Intervals. Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal in length like the hours in a day. Instead the time intervals are variable in length. This is because geologic time is divided using significant events in the history of the Earth. Humans subdivide time into useable units such as our calendar year, months, weeks, and days; geologists also subdivide time. They have created a tool for measuring geologic time, breaking it into useable, understandable segments. For the purposes of geology, the “calendar” is the geologic time scale.

This 2012 geologic time scale is an enhanced, improved and expanded version of the GTS2004, including chapters on planetary scales, the Cryogenian-Ediacaran periods/systems, a prehistory scale of human development, a survey of sequence stratigraphy, and an extensive compilation of stable-isotope chemostratigraphy.

The principal chart shows the Phanerozoic (Cambrian to Quaternary) timescale. The names of the individual periods are links: each one leads to a more detailed   Oct 16, 2018 - Explore jcampbell2299's board "Geologic Time Scale" on Geologic time scale from 650 million years ago to Living Fossils Wall Chart.

Geologic Time Scale: Divisions of Geologic Time approved by the U.S. Geological Survey Geologic Names Committee, 2010. The chart shows major chronostratigraphic and geochronologic units. It reflects ratified unit names and boundary estimates from the International Commission on Stratigraphy (Ogg, 2009).

The geologic time scale is a system used by scientists to describe Earth's history in terms of major geological or paleontological events (such as the formation of a new rock layer or the appearance or demise of certain lifeforms). Geologic time spans are divided into units and subunits, the largest of which are eons.

The geological timescale. Several geological timescales exist, reflecting the use of differing datasets and methods of interpretation. The BGS geological timechart is based on The Geologic Time Scale 2012 by F M Gradstein, J G Ogg, M Schmitz and G Ogg (2012), with additions. The result is a composite geological timechart

The geological timescale. Several geological timescales exist, reflecting the use of differing datasets and methods of interpretation. The BGS geological timechart is based on The Geologic Time Scale 2012 by F M Gradstein, J G Ogg, M Schmitz and G Ogg (2012), with additions. The result is a composite geological timechart

Read about the changes to v 4.0 (2012): GSA Bulletin Article (Walker, et al. 2013) Education & Careers. Geologic Time Scale: Divisions of Geologic Time approved by the U.S. Geological Survey Geologic Names Committee, 2010. The chart shows major chronostratigraphic and geochronologic units. It reflects ratified unit names and boundary estimates from the International Commission on Stratigraphy (Ogg, 2009). Geologic Time Scale 2012 C e n o z o i c N eogene Plioce n e Pl e i stocene Holocene Q uaternar y Age (Ma) Age / Stage E p o c h Er a Polarity Chron P er i o d Lisieki & Raymo, 2005 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 This chart was produced by Gabi Ogg using TimeScale Creator software: http: www .tscrea org Pre cam b l eo z o Mes i c T CENOZOIC MESOZOIC PALEOZOIC PRECAMBRIAN Period Epoch Numeric Age (Ma) Period Epoch Numeric Age (Ma) Period Epoch Numeric Age (Ma) Dividing Earth History into Time Intervals. Geologists have divided Earth's history into a series of time intervals. These time intervals are not equal in length like the hours in a day. Instead the time intervals are variable in length. This is because geologic time is divided using significant events in the history of the Earth.