Archivo:North america basement rocks.png

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North_america_basement_rocks.png ‎(484 × 429 píxeles; tamaño de archivo: 31 kB; tipo MIME: image/png)

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Descripción

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.

Fecha

5 de marzo de 2015

Fuente

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.

Autor

USGS

Permiso
(Reutilización de este archivo)

Esta imagen está en el dominio público, ya que contiene materiales que originalmente vinieron del Servicio Geológico de los Estados Unidos de América, una agencia del Departamento del Interior. Para obtener más información, consulte la política oficial de derechos de los USGS.

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derivative works

Obras derivadas de ésta: North america and scandinavia basement rocks.png

Historial del archivo

Haz clic sobre una fecha y hora para ver el archivo tal como apareció en ese momento.

	Fecha y hora	Dimensiones	Usuario	Comentario
actual	22:48 11 oct 2019	484 × 429 (31 kB)	Ciaurlec	Reverted to version as of 21:20, 29 September 2019 (UTC)
	13:52 30 sep 2019	484 × 429 (37 kB)	Ciaurlec	Reverted to version as of 19:38, 29 September 2019 (UTC)
	21:20 29 sep 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 sep 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 sep 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