Fitxer:Geological time spiral.png

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Fitxer original(2.424 × 2.145 píxels, mida del fitxer: 1,86 Mo, tipus MIME: image/png)


English: A diagram of the geological time scale
Esperanto: Diagramo montranta la geologian temposkalon
Français : Diagramme montrant l'échelle des temps géologiques.
Data (Version 1.1)
Font 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
Autor United States Geological Survey
Altres versions

This file was derived from: Geologica time USGS.pngGeologica time USGS.png
Derivative works of this file:


Original source:

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 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


Public domain
Aquesta imatge és de domini públic, ja que conté materials que originalment van venir del Servei Geològic dels Estats Units d'Amèrica, una agència del Departament de l'Interior dels Estats Units. Per a obtenir més informació, consulti la política oficial de drets de l'USGS.

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actual02:05, 6 jul 2012Miniatura per a la versió del 02:05, 6 jul 20122.424 × 2.145 (1,86 Mo)JohnnyMrNinjaSame image reduced from 6MB to 1.85MB. Removed unused transparency layer, indexed colors and increased compression, using en:GIMP.
00:04, 20 març 2009Miniatura per a la versió del 00:04, 20 març 20092.424 × 2.145 (6,03 Mo)NotyourbroomRecropped my own version to have borders similar to the original upload.
00:00, 20 març 2009Miniatura per a la versió del 00:00, 20 març 20092.599 × 2.458 (6,06 Mo)NotyourbroomMuch higher-res version (2599x2458@300DPI) cropped from the original PDF source.
00:51, 30 des 2008Miniatura per a la versió del 00:51, 30 des 20081.617 × 1.454 (752 Ko)Mwtoews{{Information |Description={{en|1=...}} |Source=USGS |Author=USGS |Date= |Permission= |other_versions= }} <!--{{ImageUpload|full}}-->

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