http://www.richardsnotes.org/archives/2006/12/06/the-backbone-of-america/ notes, photos, and other collectible fragments Thu, 08 Jan 2009 13:24:15 +0000 http://wordpress.org/?v=2.6 http://www.richardsnotes.org/archives/2006/12/06/the-backbone-of-america/#comment-77209 Richard Wed, 06 Dec 2006 15:25:32 +0000 http://www.richardsnotes.org/archives/2006/12/06/the-backbone-of-america/#comment-77209 David: sounds about right given that the matrix could be soft rock and the bumps harder, erosion seems like the process. If I only had a GPS active when I took this... David: sounds about right given that the matrix could be soft rock and the bumps harder, erosion seems like the process. If I only had a GPS active when I took this…

]]> http://www.richardsnotes.org/archives/2006/12/06/the-backbone-of-america/#comment-77199 David N. Wed, 06 Dec 2006 14:36:51 +0000 http://www.richardsnotes.org/archives/2006/12/06/the-backbone-of-america/#comment-77199 As far as I can judge from the photo these are layers of harder rock that are at an angle. Some of the layers are softer and have been eroded away. Your backbone clearly is not as hard as the higher escarpements around it, but slightly hard then the other parts of the valley. Glaciers would not leave these kind of traces. As far as I can judge from the photo these are layers of harder rock that are at an angle. Some of the layers are softer and have been eroded away. Your backbone clearly is not as hard as the higher escarpements around it, but slightly hard then the other parts of the valley. Glaciers would not leave these kind of traces.

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