File:North america and scandinavia basement rocks.png
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North_america_and_scandinavia_basement_rocks.png （484 × 429像素，文件大小：15 KB，MIME类型：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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这是一张修改过的图片，这意味着它已在原版本的基础上通过软件进行了编辑，改动内容：Change of colours to match some geological map colour templates。其原始版本为：North america basement rocks.png。修改者：Bjoertvedt。
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原始上传日志
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/时间 | 缩略图 | 大小 | 用户 | 备注 | |
|---|---|---|---|---|---|
| 当前 | 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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