Friday, April 08, 2011

Death Valley's Mesquite Flat Sand Dunes

The Mesquite Flat Sand Dunes in Death Valley National Park, California, were formed when the winds were slowed significantly by the narrowing of the valley and the height of Tucki Mountain. These weakened winds then deposit the Quartz sand scoured from the mountains all at once to form these dunes. Because the winds are never very strong, the dunes remain in the same place with just some minor resculpturing.
This land has an ethereal feel to it. The lighting and blowing of the wind and sand contributs to a feeling of otherworldliness, and the dunes look like velvet.

Death Valley's Mesquite Flat Sand Dunes

Death Valley's Mesquite Flat Sand Dunes - Christine Till Fine Art Photography Print
© Christine Till - CT-Graphics


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The Salt Flats of Death Valley

The low spot of California's Death Valley National Park is a gleaming white stretch that reflects the sunlight like a misplaced snow bank - one of the great icons of desert travel, a dried salt lake.
These salt flats make up a spectacular collection of chlorides, sulfates and carbonates that seem to be living and breathing and changing their way of revealing themselves on a daily basis.
Much later my car finally reached the bottom of the valley. All around me was the white expanse of the salt flat. I got out and walked a short distance out onto the billiard table surface. A small wind off to my left swirled a small whitish cloud high into the blue sky and made that swooshing sound accentuating its presence. In the distance, the mountains on all sides reached for the sky, leaving me behind in the quiet solitude of the basin.
I squatted down, rubbed my finger on the ground and tasted it. Yup, it tasted like salt alright ... and, boy, was it flat. Guess that's why they call it a salt flat.

The Salt Flats of Death Valley

The Salt Flats of Death Valley - Christine Till Fine Art Photography Print
© Christine Till - CT-Graphics


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Wednesday, April 06, 2011

Devils Postpile - America's Volcanic Past

The Devil's Postpile area in the Sierra Nevada Mountains just west of Mammoth Lakes is a National Monument, which only covers about 800 acres. It's there to save a singular geologic feature: a volcanic extrusion cooled in hexagonal basalt columns resembling a giant pipe organ. Long hidden in the high-altitude mazework of the eastern Sierra Nevada, people didn't even know Devils Postpile existed until the late 1800s.
Although not huge, Devil's Postpile, born of fire and ice as raw material from a volcano, is not something you see every day. It is unique. It is history preserved. Devils Postpile National Monument is a magnificent site to visit. The region is still a volcanically active area, as the nearby Soda Springs attest.

Devils Postpile - America's Volcanic Past

Devils Postpile - America's Volcanic Past - Christine Till Fine Art Photography Print
© Christine Till - CT-Graphics


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Devils Postpile - Nature and Science

Sixty-foot columns of basalt rise like organ pipes above pine forests on the western slopes of the Sierra Nevada Mountains near Mammoth Lakes in California.
Devils Postpile is a reflection of fire and ice. The eruption and uniform cooling of basalt lava created an impressive wall of columns. Later a glacial event exposed the columns and polished smooth the top of this formation enhancing the pattern of hexagons that are a result of the mineral composition of the lava. A hike to the top of the National Monument reveals not only a cross section of the posts, but interesting effects of the ice - the polished and scoured tops of the rock columns. The polygonal column-ends are exposed like a tiled floor, and exhibit shining surfaces where the ice polished them with fine silt; parallel striations and grooves show where the glacier dragged rocks across them.
Though Devils Postpile is not the only example of columnar-jointed basalt, but it is one of the finest.

Devils Postpile - Nature and Science

Devils Postpile - Nature and Science - Christine Till Fine Art Photography Print
© Christine Till - CT-Graphics


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Monday, April 04, 2011

Devil's Postpile - Frozen columns of lava

Devils Postpile is a U.S. National Monument located in the Sierra Nevada Mountains west of Mammoth Lakes, California.
The Devils Postpile formation is a rare sight in the geologic world and ranks as one of the world's finest examples of columnar basalt. Its columns tower 60 feet high, have an average diameter of 24 inches and display an unusual symmetry. Though the Postpile began as a molten mass, it shrank as it cooled, and it began to crack. Temperatures inside the lava bed were consistent enough to allow the cooling basalt to form six-sided columns.
The Postpile's regularity of shape is probably its most remarkable feature. Temperatures are rarely consistent enough to form columns such as are seen here.

Devil's Postpile - Frozen columns of lava

Devil's Postpile - Frozen columns of lava - Christine Till Fine Art Photography Print
© Christine Till - CT-Graphics


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Mono Basin Landscape - California

For the last three to four million years the whole Mono Basin has been tilting westward and sinking while the Sierra has been rising. This ongoing process has created the majestic contrast of a desert lake bordered by high mountain peaks.
Located in California's spectacular Eastern Sierra, Mono Lake, an ancient saline lake, supports a unique and productive ecosystem. The lake has no fish; instead it is home to trillions of brine shrimp and alkali flies (the name Mono actually means "flies" in the native Yokut language). Along the lakeshore, scenic limestone formations known as tufa towers rise from the water's surface. This oasis in the dry Great Basin is a vital habitat for millions of migratory and nesting birds that feed on the shrimp.
From 1941 until 1990, the city of Los Angeles diverted excessive amounts of water from Mono Lake's tributary streams 350 miles south to meet the growing water demands of Los Angeles. Deprived of its freshwater sources, Mono Lake, the largest natural lake completely within the state of California, dropped 45 vertical feet, lost half its volume, and doubled in salinity. Unable to adapt to these changing conditions within such a short period of time, the ecosystem began to collapse. If something was not done, Mono Lake was certain to become a lifeless chemical sump.
For 30 years people of the Mono Lake area have been working to protect Mono Lake from destruction, to heal the damage done in the Mono Basin, and to educate the public about the natural environment and wise water use. In 1994, after over a decade of litigation, the State of California ordered the city of Los Angeles to allow Mono Lake to rise to a healthy level. It is now slowly rising toward that goal ... foot by foot.

Mono Basin Landscape - California

Mono Basin Landscape - California - Christine Till Fine Art Photography Print
© Christine Till - CT-Graphics


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