Tag Archives: geology

Photographs: Nature, Photographs: Sierra Nevada

Patterned Cliff Face, Detail

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Patterned Cliff Face, Detail
A small section of shaded Sierra Nevada cliff reveals remarkable details of dikes, fractures, color, and stains

Patterned Cliff Face, Detail. © Copyright 2018 G Dan Mitchell – all rights reserved.

A small section of shaded Sierra Nevada cliff reveals remarkable details of dikes, fractures, color, and stains

Most often when I think of large rocky faces in the Sierra Nevada, the clean, smooth, and almost uniform faces of Yosemite granite come to mind — large expanses of nearly unbroken rock shaped by glaciers. However, when I get into the high country and the other areas of the range I am reminded that things aren’t quite so simple. In places you can find mountains cut through by giant dikes of non-granite rock, or you might encounter the remnants of more ancient layers that lay above the granite intrusions and today give us red, black and other colors of material.

Since I’m no geologist, I can’t explain the details of the face in this photograph, but I can share a few observations. It is the headwall of a high bowl that contains a subalpine lake, and the area does show signs of glaciation. The fact is gigantic, and this is just a small section. It is far from uniform, with mostly gray rock cut through by thick intrusions of lighter material, and the whole thing cracked and fractured. In many places the surface has been deeply stained as water has flowed or seeped across it.

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G Dan Mitchell is a California photographer and visual opportunist. His book, “California’s Fall Color: A Photographer’s Guide to Autumn in the Sierra” is available from Heyday Books and Amazon.
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Photographs: Nature, Photographs: Sierra Nevada, Photographs: Yosemite

Detail, Granite Face

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Detail, Granite Face
Detail view of a section of a Yosemite Valley granite cliff face

Detail, Granite Face. © Copyright 2018 G Dan Mitchell – all rights reserved.

Detail view of a section of a Yosemite Valley granite cliff face

Yosemite, and especially Yosemite Valley, is famous for its “granite” (quotation marks for any geologists reading this post…) cliffs, towers, domes, slabs, and other formations. While we tend to think of this rock as being “gray,” the coloration varies quite a bit depending on the nature of the rock itself, the presence of lichens or plants, and on the light. Almost everywhere the expanses of granite are cut through by intrusions of different colored rocks. I don’t usually think of this particular face as being all that colorful, but on this morning the light somehow brought out the rust-colored tones on many sections of the rock.

I did just enough rock climbing many years ago to have developed memories of the sensations of such rock, from the cold and smooth slabs, to sharp edges of cracks, and rough surfaces (you hope!) on some friction routes. A close look at this section of cliff reveals an amazing variety of surfaces and irregularities. Perhaps most obvious is the large, curving vertical crack towards the left. The dark water stains are also striking, as is that rust colored rock. A closer look reveals other patterns, including a diagonal rising from left to right.

G Dan Mitchell is a California photographer and visual opportunist. His book, “California’s Fall Color: A Photographer’s Guide to Autumn in the Sierra” is available from Heyday Books and Amazon.
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Photographs: Death Valley, Photographs: Desert, Photographs: Nature

Mud Hills, Evening Light

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Mud Hills, Evening Light
Mud hills near the mouth of a Death Valley canyon

Mud Hills, Evening Light. Death Valley National Park, California. April 4, 2017. © Copyright 2017 G Dan Mitchell – all rights reserved.

Mud hills near the mouth of a Death Valley canyon

On this evening I had taken a “random” walk into a canyon that I hadn’t visited before. It isn’t a tremendously popular place, so I had its narrow confines almost completely to myself, even though I wasn’t all that far from some rather popular Death Valley locations. The canyon itself was not the most visually striking Death Valley location I have visited, though its narrow dimensions and solitude were notable. I reached a blockage some distance up the canyon, and since the hour was getting late I decided to reverse course and head back out for early evening light.

As is so often the case with these canyons, I emerged from the dark and narrow canyon onto a broad wash that expanded onto an alluvial fan littered with boulders, cut by water courses, and open to more distant views. Golden hour light was beginning, so there was a lot to photograph, and it took me quite a while to work my way down from here toward the trailhead. As I walked, the surrounding hills became lower and more rounded as they gradually merged with the alluvial slopes that tend to line the valley. As the light faded with the already behind hills to the west, I made a final stop to photograph these folded forms, glowing in the filtered and soft light of early evening.

G Dan Mitchell is a California photographer and visual opportunist. His book, “California’s Fall Color: A Photographer’s Guide to Autumn in the Sierra” is available from Heyday Books and Amazon.
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All media © Copyright G Dan Mitchell and others as indicated. Any use requires advance permission from G Dan Mitchell.

Photographs: Abstract, Photographs: Imaginary Landscapes, Photographs: Nature, Photographs: Sierra Nevada, Photographs: Yosemite

Cliff Detail

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Cliff Detail
A section of a Yosemite Valley cliff

Cliff Detail. Yosemite National Park, California. February 26, 2017. © Copyright 2017 G Dan Mitchell – all rights reserved.

A section of a Yosemite Valley cliff

I was in Yosemite Valley for the weekend, initially for the opening reception for the Yosemite Renaissance 32 exhibit in the Yosemite Museum Gallery next to the Visitor Center. Friday was all about the exhibit — the wonderful reception and then afterwards with my many friends among the artists in the show and others artists who have a connection to the event. This was also the seasonal peak of the annual Horsetail Fall excitement, a phenomenon that brings hordes of people to a couple of small areas… but consequently brings a degree of solitude and quiet to many other parts of the Valley.

In any case, my visit was also an excuse for photography. On my last morning there I was up an out in the 17 degree chill before sunrise. I headed to a nearby clear area from which I had an unobstructed view of some of the mighty cliffs. As I photographed I alternated between subjects that were typical landscape material — trees on ledges, morning light slanting across granite, snow and ice — and more abstract images focusing a sort of disembodied landscape and isolation striking bits of pattern and color high on the cliff walls.

G Dan Mitchell is a California photographer and visual opportunist. His book, “California’s Fall Color: A Photographer’s Guide to Autumn in the Sierra” is available from Heyday Books and Amazon.
Blog | About | Flickr | Twitter | Facebook | Google+ | LinkedIn | Email

All media © Copyright G Dan Mitchell and others as indicated. Any use requires advance permission from G Dan Mitchell.