Gneiss by OldHippieKeyboard

Photography • Landscape • posted on Oct 03, 2007

Open full image in new tab Zoom on image

Hover over top left image to zoom.
Click anywhere to exit.

Members remain the original copyright holder in all their materials here at Renderosity. Use of any of their material inconsistent with the terms and conditions set forth is prohibited and is considered an infringement of the copyrights of the respective holders unless specially stated otherwise.

Description

OK, class ... this is your geology lesson for today. Get out your note paper -- there will be a quiz later... "At the time the rocks of the Blue Ridge Mountains were being thrust up by tremendous forces that slowly squeezed the rocks of the region very much like a huge vise, other natural processes of weathering and erosion started tearing down the young mountains. Now, after more than 250 million years have passed, mountain building has ended and erosion has gradually stripped off the uppermost miles of rocks that were originally here. In the process, rocks that were once buried and squeezed under the weight of miles of rock are now exposed at the top of the Blue Ridge Mountains. These old rocks were drastically changed (metamorphosed) by high pressure and temperature during the hundreds of millions of years while they were still buried. Geologists have classified these metamorphic rocks as GNEISS (pronounced "nice"). The age of the gneiss has been determined to be 1,055 million years by the geologists of the U.S. Geological Survey." -- Blue Ridge Brochure