Slika:Geological time spiral.png

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Povzetek

Opis
English: A diagram of the geological time scale
Esperanto: Diagramo montranta la geologian temposkalon
Français : Diagramme montrant l'échelle des temps géologiques.
Datum september 2008 (Version 1.1)
Vir Graham, Joseph, Newman, William, and Stacy, John, 2008, The geologic time spiral—A path to the past (ver. 1.1): U.S. Geological Survey General Information Product 58, poster, 1 sheet. Available online at http://pubs.usgs.gov/gip/2008/58/
Avtor United States Geological Survey
Druge različice

Ta datoteka je izpeljana iz: Geologica time USGS.png
Izpeljana dela te datoteke:

Caption

Original source: http://pubs.usgs.gov/gip/2008/58/geotimespiral_text.pdf

The Earth is very old—4.5 billion years or more according to scientific estimates. Most of the evidence for an ancient Earth is contained in the rocks that form the Earth's crust. The rock layers themselves—like pages in a long and complicated history—record the events of the past, and buried within them are the remains of life—the plants and animals that evolved from organic structures that existed 3 billion years ago.

Also contained in rocks once molten are radioactive elements whose isotopes provide Earth with an atomic clock. Within these rocks, "parent" isotopes decay at a predictable rate to form "daughter" isotopes. By determining the relative amounts of parent and daughter isotopes, the age of these rocks can be calculated. Thus, the scientific evidence from rock layers, from fossils, and from the ages of rocks as measured by atomic clocks attests to a very old Earth.

See USGS Fact Sheet 2007-3015 at http://pubs.usgs.gov/fs/2007/3015/ for ages of geologic time periods. Ages in the spiral have been rounded from the age estimates in the Fact Sheet. B.Y., billion years; M.Y., million years. For more information, see the booklet on Geologic Time at http://pubs.usgs.gov/gip/geotime/.

Licenca

Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Diagram of the geological time scale

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motiv

september 2008

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Datum in časSličicaVelikostUporabnikKomentar
trenutno02:05, 6. julij 2012Sličica za različico z datumom 02:05, 6. julij 20122.424 × 2.145 (1,86 MB)JohnnyMrNinjaSame image reduced from 6MB to 1.85MB. Removed unused transparency layer, indexed colors and increased compression, using en:GIMP.
00:04, 20. marec 2009Sličica za različico z datumom 00:04, 20. marec 20092.424 × 2.145 (6,03 MB)NotyourbroomRecropped my own version to have borders similar to the original upload.
00:00, 20. marec 2009Sličica za različico z datumom 00:00, 20. marec 20092.599 × 2.458 (6,06 MB)NotyourbroomMuch higher-res version (2599x2458@300DPI) cropped from the original PDF source.
00:51, 30. december 2008Sličica za različico z datumom 00:51, 30. december 20081.617 × 1.454 (752 KB)Mwtoews{{Information |Description={{en|1=...}} |Source=USGS |Author=USGS |Date= |Permission= |other_versions= }} <!--{{ImageUpload|full}}-->

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