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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
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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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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,
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for more information. If an SVG form of this image is available, please upload it and afterwards replace this template with
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This file contains additional information, probably added from the digital camera or scanner used to create or digitize it.
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Major colour change to make conform to
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The following pages on the
English Knowledge use this file (pages on other projects are not listed):
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It is recommended to name the SVG file “North america basement rocks.svg”—then the template
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File:North america and scandinavia basement rocks.png
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English
Knowledge, original upload 22 April 2005 by
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Commons is a freely licensed media file repository.
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1502:Користувач:Alex Blokha/Події в Вікіпедії/25 вересня
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1104:Talk:Abiogenic petroleum origin/Archive 1
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1457:Slave Craton
1332:Cratone Nain
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805:5 March 2015
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200:5 March 2015
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1367:楯状地とクラトンの一覧
1327:Cratone Rae
175:Description
1432:اتر آمريڪا
1362:ノースダコタ州の地理
1242:Supra Lago
1074:Rae Craton
1015:File usage
989:484 × 429
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