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Photographer's Note

Granite

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Driving through the Yosimite National Park gives great opportunities for breathtaking views (soon in this theatre) and impressive rockformations (yesterday), but I also like to look at the details of the overwhelming natural beauty.

In a city I admire the skyline, the separate buildings and details of the buildings.
In a museum I look at the architecture of the building, the art and how the exhibition is presented and the interaction with the visitors..


In nature I found out that I love the wider views, but that they become even more attractive if I also examined the details

So today three pictures with close-ups of the structure of the vertical El Capitan rock-formation

■ Main picture: Strong verical fault lines
■ Workshop 1: Flatter part of the rock-formation
■ Workshop 2: Rock Edge


Make: SONY-ILCE-6300
Software: PaintShop Pro 19,00
Exposure Time: 1/350 sec
F-Stop: f/6.7
ISO Speed Ratings: 100
Focal Length: 200 mm
Date Taken: 2017-08-10 12:21
Metering Mode: Pattern
Flash: Flash did not fire, compulsory flash mode
File Size: 1421 kb

El Capitan is composed almost entirely of granite, a pale, coarse-grained granite emplaced approximately 100 mya (million years ago). In addition to El Capitan, this granite forms most of the rock features of the western portions of Yosemite Valley. A separate intrusion of igneous rock, the Taft Granite, forms the uppermost portions of the cliff face.
A third igneous rock, diorite, is present as dark-veined intrusions through both kinds of granite, especially prominent in the area known as the North America Wall.
Along with most of the other rock formations of Yosemite Valley, El Capitan was carved by glacial action. Several periods of glaciation have occurred in the Sierra Nevada, but the Sherwin Glaciation, which lasted from approximately 1.3 million years ago (mya) to 1 mya, is considered to be responsible for the majority of the sculpting. The El Capitan Granite is relatively free of joints, and as a result the glacial ice did not erode the rock face as much as other, more jointed, rocks nearby. Nonetheless, as with most of the rock forming Yosemite's features, El Capitan's granite is under enormous internal tension brought on by the compression experienced prior to the erosion that brought it to the surface. These forces contribute to the creation of features such as the Texas Flake, a large block of granite slowly detaching from the main rock face about halfway up the side of the cliff. (Wikipedia)

Tue, papagolf21, Royaldevon, holmertz, ChrisJ, ikeharel, pajaran, Eric_vd, Fis2 has marked this note useful

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Additional Photos by Rob Zwemmer (alvaraalto) Gold Star Critiquer/Gold Star Workshop Editor/Gold Note Writer [C: 4290 W: 318 N: 6279] (25272)
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