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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.
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This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of 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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- (del) (cur) 23:53, 14 November 2004 . . en:User:Vsmith Vsmith ( en:User_talk:Vsmith Talk) . . 217x324 (39818 bytes) (Banded Skagit gneiss)
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