File:North america basement rocks.png

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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

5 March 2015

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. Replaced when this better version found.

Author

USGS

Permission
(Reusing this file)

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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derivative works

Derivative works of this file: North america and scandinavia basement rocks.png

File history

Click on a date/time to view the file as it appeared at that time.

	Date/Time	Dimensions	User	Comment
current	22:48, 11 October 2019	484 × 429 (31 KB)	Ciaurlec	Reverted to version as of 21:20, 29 September 2019 (UTC)
	13:52, 30 September 2019	484 × 429 (37 KB)	Ciaurlec	Reverted to version as of 19:38, 29 September 2019 (UTC)
	21:20, 29 September 2019	484 × 429 (31 KB)	Ciaurlec	Major colour change to make conform to Geologic time scale where possible. Used also some other graphic changes as in File:North america and scandinavia basement rocks.png 2nd upload
	19:38, 29 September 2019	484 × 429 (37 KB)	Ciaurlec	Major colour change to make conform to Geologic time scale where possible. Used also some other graphic changes as in File:North america and scandinavia basement rocks.png
	15:47, 16 September 2005	484 × 429 (13 KB)	Saperaud~commonswiki	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, patte