Saturday, December 23, 2006
Lines in the Rock--Saturday Photo Hunt
Checkerboard Mesa, Zion National Park, Utah
This is what the sign told me about the cracks in the rock:
"The horizontal lines, commonly called crossbedding, represent layers of wind-blown sand that built up into sand dunes. These dunes were then buried, and the sand grains glued together by calcite and iron oxide to form sandstone. . . . The vertical lines are less common. They are actually shallow cracks that result from stress and erosion on the rock surface. These cracks are probably caused by expansion and contraction, temperature changes, wetting/drying, or a combination of these processes.
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8 comments:
What a great picture for today's theme!
Merry Christmas!
That's just beautiful! Thanks for the explanation too :)
Great lines for the theme. I will have to direct my daughter here. She is a geology major and loves rocks of all types, weather, volcanoes and such.
Have a very happy Christmas!
Mine is up too.
That almost looks like--dinosaur skin! Great picture!
great composition, very nice!
Wonderful picture! Oooh, it does look like dinosaur skin Attila :)
Very interesting! (It looks like MY skin lol)
Great picutre for the LINES!
Sunflower
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