Datoteka:North america and scandinavia basement rocks.png
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North_america_and_scandinavia_basement_rocks.png (484 × 429 piksela, veličina datoteke: 15 KB, MIME tip: 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. |
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This is a retouched picture, which means that it has been digitally altered from its original version. Modifications: Change of colours to match some geological map colour templates. The original can be viewed here: North america basement rocks.png:  . Modifications made by Bjoertvedt.
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Originalni zapisnik postavljanja
This image is a derivative work of the following images:
- File:North_america_basement_rocks.png licensed with PD-USGov-USGS
- 2005-09-16T15:47:59Z Saperaud 484x429 (13371 Bytes) [[North America]]n [[craton]]s 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 interio
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| Datum/vrijeme | Smanjeni pregled | Dimenzije | Korisnik | Komentar | |
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| trenutno | 23:34, 1 april 2011 | | 484 × 429 (15 KB) | Bjoertvedt | {{Information |Description=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 o |
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