Slika:North america basement rocks.png

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North_america_basement_rocks.png ‎(484 × 429 točk, velikost datoteke: 31 KB, MIME-vrsta: image/png)

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Opis

North American cratons and basement rocks.

As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interior of the mountain belts, patterns of age intervals were determined. These old rocks have been called the "basement". This has been interpreted to mean that the continents had somehow grown by development of rock assemblages with these characteristic age parameters. The expanding continental nuclei are part of the "craton" which consist of both exposed and buried basement rocks.
Datum
Vir http://rst.gsfc.nasa.gov/Sect2/14strprv.jpg or http://instruct.uwo.ca/earth-sci/300b-001/14strprv.gif English Wikipedia, original upload 22 April 2005 by Berkut Originally uploaded by User:SEWilco as Image:North america basement rocks.jpg. Replaced when this better version found.
Avtor USGS
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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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Izpeljana dela te datoteke:  North america and scandinavia basement rocks.png

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North American cratons and basement rocks

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motiv

kraton

podlaga

nastanek

5. marec 2015

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Datum in časSličicaVelikostUporabnikKomentar
trenutno00:48, 12. oktober 2019Sličica za različico z datumom 00:48, 12. oktober 2019484 × 429 (31 KB)CiaurlecReverted to version as of 21:20, 29 September 2019 (UTC)
15:52, 30. september 2019Sličica za različico z datumom 15:52, 30. september 2019484 × 429 (37 KB)CiaurlecReverted to version as of 19:38, 29 September 2019 (UTC)
23:20, 29. september 2019Sličica za različico z datumom 23:20, 29. september 2019484 × 429 (31 KB)CiaurlecMajor colour change to make conform to Geologic time scale where possible. Used also some other graphic changes as in File:North america and scandinavia basement rocks.png 2nd upload
21:38, 29. september 2019Sličica za različico z datumom 21:38, 29. september 2019484 × 429 (37 KB)CiaurlecMajor colour change to make conform to Geologic time scale where possible. Used also some other graphic changes as in File:North america and scandinavia basement rocks.png
17:47, 16. september 2005Sličica za različico z datumom 17:47, 16. september 2005484 × 429 (13 KB)Saperaud~commonswikiNorth American cratons and basement rocks. As radiometric ages were determined for the shield-like rocks on the continents which were either exposed at the surface, underlay the flat rocks, or were within the interior of the mountain belts, patte

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