Sandstone Fins Arches National Park
|Copyright: ML LGB (mlgb)
|Date Taken: 2008-10-10|
|Camera: Olympus D-560 Zoom|
|Exposure: f/3.9, 1/320 seconds|
|More Photo Info: [view]|
|Photo Version: Original Version|
|Date Submitted: 2008-11-17 15:55|
|[Note Guidelines] Photographer's Note|
|Arches National Park near Moab, Utah is located in a "high desert," with elevations ranging from 4,085 to 5,653 feet above sea level. The climate is one of very hot summers, cold winters and very little rainfall. Even on a daily basis, temperatures may fluctuate as much as 50 degrees. Arches National Park lies atop an underground salt bed called the “Paradox Formation” which is responsible for the arches, spires, balanced rocks, fins and eroded monoliths common throughout the park. Thousands of feet thick in places, the Paradox Formation was deposited over 300 million years ago when seas flowed into the region and eventually evaporated. Over millions of years, the salt bed was covered with the residue of floods and winds as the oceans returned and evaporated again and again. Much of this debris was cemented into rock. At one time this overlying layer of rock may have been more than a mile thick.|
Salt under pressure is unstable, and the salt bed below Arches began to flow under the weight of the overlying sandstones. This movement caused the surface rock to buckle and shift, thrusting some sections upward into domes, dropping others into surrounding cavities, and causing vertical cracks which would later contribute to the development of arches. Water seeped into cracks and joints, washing away loose debris and eroding the "cement" that held the sandstone together, leaving a series of free-standing fins.
The fins and arches are found primarily of the salmon-colored Entrada Sandstone, which glows red around sunset. About 5 minutes before I took this photo, a large thin slab exfoliated and fell from the top of the fin to the far right. Unfortunately the camera was not out! Photo was taken in the last hour before sunset in mid-October.
Source: National Park Service website for Arches.
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I know right where this was taken. The light and color and inclusion of the moon are really nice. I can't imaging having a slab fall right near you! One always wonders about it but I've never witnessed it. It is a nice shot.
Evelynn : )
amazing formations, great light, TFS Ori
- [2008-11-18 2:32]
Fantastic place and wonderful game of lights and shadows, tfs