| "Geological
Features and Artifacts" Nov 26, 2001 |
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Utah
Canyons
Photos by William L. Salkin |
The Canyons of Utah by
William
L. Salkin
Samples from the winner of "Best of Show" award at the 2001 NSA convention.
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Cottonwood Narrows 1--
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Cottonwood Narrows --
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Fisher Towers --
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Peek-a-boo Gulch --
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Waterholes Canyon --
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Crystal
Canyons
Photos by John Hart |
Crystal Canyons by John
Hart
www.crystalcanyons.com
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The Subway-- Slot Canyon in Zion National Park
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The Cathedral -- Pine Creek Canyon in Zion National Park
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Big Rappel -- Lomatium Canyon in Arches National Park
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Avalanche Creek Canyon -- Glacier Nation Park
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Caves
and Minerals
Photos by David W. Kesner |
Caves and Minerals by
David
W. Kesner
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Coral Mushroom -- a lava tube cave coral and mushrooms of an undetermined
complex mineral deposit (calcium, slica, magnesium, sulfate, etc.).
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Eroded Gypsum -- a section of gypsum in a lava tube cave that is
being slowly eroded away by air currents. On the left side you can see
a handprint done by a vicious cave vandal!
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Gypsum Coral -- a section of gypsum with secondary calcite cave
coral growing on it. From the same lava tube as above.
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Lava Spire -- a "mini-volcano" of lava that is extuded up through
a whole in the floor where a pool or river of molten lava was flowing under
a hardened layer. If the lava is very viscous, it builds up in these spires.
These are about 2-3 feet tall.
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Flat Spire -- same as above except the lava is much thinner and
can't build-up. Instead it flows out and forms these "petrified cowpies".
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Lava Pearl -- cave pearls in limestone caves are well known, but
have never been reported in a lava tube cave. Here the basalt bedrock is
broken down into small pebbles that get polished by dripping water. That
same water is rich in minerals that eventually coat the pebbles the same
way that limestone or natural pearls are made. The black is the basalt
and the white is the secondary mineral (a complex combination like that
above).
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Quartz Bi-Crystal -- a double quartz crystal.
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Quartz Crystals -- a multiple quartz crystal.
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Aerial
Views
Photos by Gabriel Jacob |
Aerial Views by Gabriel
Jacob
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The Dead Sea -- showing salt production in the foreground.
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The Grand Canyon --
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Hoover Dam --
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Las Vegas, Nevada --
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Sedona, Arizona --
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Sedona, Arizona --
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San Francisco, California --
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Eroding
Gypsum
Photos by Gary Nored |
Erosion by Gary
Nored
Eroding gypsum at the Caprock Canyonlands state park in the Texas Panhandle.
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Gypsum Dome -- shows "bubbles" of gypsum protruding through new
soil. Gypsum swells when wet. The top layer gets wetter than lower layers
causing "domes" to pop up over a short period of time.
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Water Eroded Gypsum -- illustrates the very different appearance
of an inclined layer of gypsum that protrudes into running water.
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Creek Bed -- gypsum layers embedded in a red sandstone matrix. Illustrating
the early stage of erosion of a formation with layers of varying hardness.
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Landforms
and Fossils
Photos by Dale Walsh, Stuart Stiles,
Robert MacLeay, and Lynda Nygren, |
Landforms and Fossils
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Balancing Rock -- Dale Walsh
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Brachiopod Fossil -- Brachiopod fossils are the object of frequent
treasure hunts on the hill of Devonian Era glacial till, where we have
our family cabin. In the top piece of water-torn stone, there are imprinted
molds of shells. In the lower rock, a slab stone wall, there is a casting
of a shell. Both types of fossil structures reveal the outer features of
the creature. -- Stuart Stiles
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Petrified Log -- Dale Walsh
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Schoodic Point, Maine -- looking south to Bar Harbor in the far
distance. -- Robert MacLeay.
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Devil's Tower -- Linda Nygren
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Theodore Roosevelt National park -- Linda Nygren
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