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Skagit-gneiss-Cascades.jpg (217 × 324 pixels, file size: 39 KB, MIME type: image/jpeg)

Banded Skagit gneiss with cross-cutting dike of younger granite orthogneiss. Orthogneiss of at least two different ages makes up much of the Skagit Gneiss Complex. Some magma intruded while rocks of the Metamorphic Core Domain were being squeezed and probably folded. While the magma crystallized or soon thereafter, the squeezing (or flattening) aligned the minerals and the rock became foliated orthogneiss. Twenty million years or so later, much of the squeezing had ceased. When new magma invaded, the newly crystallized granitic rocks developed much less foliation than their predecessors.

Transferred from en.wikipedia to Commons by Maksim.

The original description page was here. All following user names refer to en.wikipedia.
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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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From: http://www2.nature.nps.gov/geology/usgsnps/noca/sb9migma.html

date/time username edit summary
23:59, 14 November 2004 en:User:Vsmith
23:53, 14 November 2004 en:User:Vsmith (Banded Skagit gneiss)

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Date/TimeThumbnailDimensionsUserComment
current15:13, 10 September 2015Thumbnail for version as of 15:13, 10 September 2015217 × 324 (39 KB)NawlinWikiReverted to version as of 18:11, 3 February 2006
18:11, 3 February 2006Thumbnail for version as of 18:11, 3 February 2006217 × 324 (39 KB)MaksimLa bildo estas kopiita de wikipedia:en. La originala priskribo estas: Banded Skagit gneiss {{PD-USGov-Interior-USGS}} From: http://www2.nature.nps.gov/geology/usgsnps/noca/sb9migma.html {| border="1" ! date/time || username || edit summary |---- | 23:5

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