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This handout lists major events in Earth history with approximate ages (in millions of years before present). The calendar date is determined by setting midnight, January 1, to correspond with the formation of the Earth, and setting the following midnight, December 31, to correspond to the present. Thus, the entire history of the Earth is displayed as a single calendar year. Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Presentation / Demo
Subject: Geologic time
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This project aims to reconcile the international stratigraphic standards with many of the regional and archaic naming schemes that appear in the literature. In the process, the most recent International Commission on Stratigraphy (ICS) time scale has been combined with information on the estimated placement and length of other stages in order to put approximate dates on all of the stratigraphic intervals ... Full description.
Grade level: High (9-12), College (13-14), College (15-16), Graduate / Professional
Resource type: Ref. material, Modeled dataset
Subject: Geologic time
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This time scale allows students to select multiple time periods from a list and view them on a highlighted display. It shows the relationship between eon, era, period, sub-period, and epoch and also includes the date in mega-annum (Ma) or millions of years before present. The scale reflects the changes in the Cenozoic Era (Tertiary and Quaternary have been eliminated and the Neogene modified) in the ... Full description.
Grade level: Intermediate (3-5), Middle (6-8), High (9-12)
Resource type: Visualization - scientific, Calculation / Conversion tool
Subject: Geologic time
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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The rings on a tree tell a tale - each ring holds clues about that particular year. This radio broadcast reports on an archaeologist who is using the rings to date events in ancient history. This method produces an unconventional date for the Thera volcano eruption, which may cause a rewriting of Mediterranean history. The clip is 2 minutes in length. Full description.
Grade level: General public
Resource type: Radio broadcast
Subject: Geologic time
 
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This broadcast describes the four great Eons of history: the Hadean, the Archean, the Proterozoic and the Phanerozoic. Together, they encompass four and a half billion years. How can we begin to make sense of such a huge swathe of time? And can we be sure that we have got the age of the Earth right? Geologists use Eras, Periods and Epochs to further punctuate what is known as Deep Time, but can we ... Full description.
Grade level: High (9-12), General public
Resource type: Radio broadcast
Subject: Geologic time
 
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This is the geological time scale developed by the British Geological Survey. The principal chart is the Phanerozoic (Cambrian to Quaternary) timescale. The names of the individual periods are live links, each one leading to a chart showing the subdivisions of each period into epochs and ages. The Proterozoic and Neoproterozoic sections are also linked to further subdivisions into eras and periods. ... Full description.
Grade level: Middle (6-8), High (9-12), College (13-14)
Resource type: Illustration - scientific, Ref. material
Subject: Geologic time
 
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In this activity students convert major events in Earth history from years before present into scale distances. After a list of events and their scale distances have been formulated, students construct a geologic time scale on 5 meters of adding machine paper, beginning with the formation of the Earth. Students will investigate change through geologic time; design, construct and interpret a model ... Full description.
Grade level: Intermediate (3-5), Middle (6-8), High (9-12)
Resource type: Classroom activity
Subject: Geologic time
 
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Educational standards associated with this resource:
National Science Education Standards (NSES), National Geography Standards: Read
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This exercise can be used to demonstrate changes in the Earth through time, and the length of time it took for those changes to take place. A list of Important Dates in Earth History is provided that contains the dates of the events shown on a time clock. The teacher can pick events from the list of key events and calculate (or have students calculate) the time for the key events they wish to use. ... Full description.
Grade level: Intermediate (3-5), Middle (6-8)
Resource type: Classroom activity, Presentation / Demo
Subject: Geologic time
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This text assists in understanding time relationships and how life on Earth has changed over time. The dates shown were compiled from several available sources. The first page shows some important events in Earth history, presented in the order in which they occurred. The data are also shown on the scale of a calendar year. On the second sheet is a chart showing the geologic eras, systems, and series. ... Full description.
Grade level: Middle (6-8), High (9-12)
Resource type: Ref. material
Subject: Geologic time
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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This outdoor exercise shows students the great expanse of time that has elapsed between the formation of Earth and the emergence of living creatures, particularly humans. The great length of the football field helps reinforce the idea of the vast amounts of time that have passed. Starting on one goal line, they will mark off distances representing the times of various events, rocks, fossils, or geologic ... Full description.
Grade level: Intermediate (3-5), Middle (6-8), High (9-12)
Resource type: Classroom activity, Field activity
Subject: Geologic time
 
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Educational standards associated with this resource:
National Science Education Standards (NSES): Read
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