File:North america and scandinavia basement rocks.png
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North_america_and_scandinavia_basement_rocks.png （484 × 429 像素，檔案大小：15 KB，MIME 類型：image/png）
| 描述 | 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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這是一張修飾過的圖片，即本圖片是用軟體修改過後的版本，修改的方式或內容有：Change of colours to match some geological map colour templates。原版圖片來源：North america basement rocks.png。修改者：Bjoertvedt。
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原始上傳日誌
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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| 日期/時間 | 縮圖 | 尺寸 | 使用者 | 備註 | |
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| 目前 | 2011年4月1日 (五) 21:34 | | 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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