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File:NA basement rocks.gif

NA_basement_rocks.gif (483 × 427 pixels, file size: 19 KB, MIME type: image/gif)

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English: Original image first published on Wikipedia 22 April 2005, since superseded by altered image; this one is being republished because altered image used colours too close to each other, and to accommodate those with visual difficulties
Date
Source
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 assemblages with these characteristic age parameters. The expanding continental nuclei are part of the "craton" which consist of both exposed and buried basement rocks.
Date  Edit this at Structured Data on Commons
Source http://rst.gsfc.nasa.gov/Sect2/14strprv.jpg or http://instruct.uwo.ca/earth-sci/300b-001/14strprv.gif English Wikipedia, original upload 22 April 2005 by Berkut Originally uploaded by User:SEWilco as Image:North america basement rocks.jpg.
Author USGS
Permission
(Reusing this file)
Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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Author USGS

Licensing

Public domain
This work is in the public domain in the United States because it is a work prepared by an officer or employee of the United States Government as part of that person’s official duties under the terms of Title 17, Chapter 1, Section 105 of the US Code. Note: This only applies to original works of the Federal Government and not to the work of any individual U.S. state, territory, commonwealth, county, municipality, or any other subdivision. This template also does not apply to postage stamp designs published by the United States Postal Service since 1978. (See § 313.6(C)(1) of Compendium of U.S. Copyright Office Practices). It also does not apply to certain US coins; see The US Mint Terms of Use.
This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights.

Captions

Basement rocks in North America

Items portrayed in this file

depicts

inception

22 April 2005

media type

image/gif

File history

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Date/TimeThumbnailDimensionsUserComment
current05:32, 27 June 2023Thumbnail for version as of 05:32, 27 June 2023483 × 427 (19 KB)Toast for TeddyCropped extraneous space
15:41, 31 December 2020Thumbnail for version as of 15:41, 31 December 2020487 × 474 (18 KB)KablammoUploaded 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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