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Summary
| Description |
North American
cratons and basement rocks. English: Original image first published on Wikipedia 22 April 2005, since superseded by altered image; this one is being republished because altered image used colours too close to each other, and to accommodate those with visual difficulties |
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| Author | USGS |
Licensing
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File history
Click on a date/time to view the file as it appeared at that time.
| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 05:32, 27 June 2023 |
| 483 × 427 (19 KB) | Toast for Teddy | Cropped extraneous space |
| 15:41, 31 December 2020 |
 | 487 × 474 (18 KB) | Kablammo | Uploaded a work by USGS from {{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 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 a... |
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