Rio Yuruani: It has 96 kilometers long, was born in the Saran-tepuy and Mount Yuruani and falls in the river Kukenan Yurua. Canaima National Park: Enacted National Park on June 12, 1962. Has an area of 3,000,000 hectares, one of the largest in the world. Place of breathtaking beauty, unique in the world, presented in its western region of the Guiana Shield impenetrable jungle, on the eastern side, large sheets full of flora and fauna, rivers crossed by stormy. Its skyline dominated by tepuyes tabular formations of vertical walls, consisting of multicolored sandstone, quartzite and agglomerates, carved by erosion thousands of years, and totally flat on top.
Borrowed from LA GRAN SABANA
The Yuruani Falls. They're about 90 meters across and about 8 meters tall. Pretty impressive power and the roar of the water attests to that. The coloration is slightly brown from the tanin of decomposing vegetation.
What Makes a Pothole ?
The list of ingredients is pretty short. Bedrock. Turbulent water. And the abrasive mixture that geologists call suspended sediment. Start with bedrock. Without it, potholes won't form. Why? Anything less rock-solid will simply be washed away. "Washed away"? Potholes are carved from rock, and moving water provides the energy. This leaves only the suspended sediment. It provides the cutting tools for the job. Three ingredients: rock, water, sediment. Three roles: medium, muscle, tool. Nature as sculptor, in other words. This is all it takes. Each new irregularity generates more turbulence, and every increase in turbulence breeds new irregularities. The milling materials — sediments ranging in size from silt to cobbles — then do their work, tirelessly grinding away. Soon a cavity starts to form in what was once smooth rock. A pothole is born.
Borrowed from PADDLING
POTHOLES on river YURUANI :
To log this Earthcache please EMAIL ME krutizlab.geo@gmail.com the answers to the following questions :
- Find any stone pot on the mentioned coordinates and compare input and inner average - why are they different?
- Try to determine the rock, which is bedrock of the river formed.
- Why are there more stone pots by the shore than in the main flow?
- Take a foto (optionaly) you with GPS and the waterfall in the background.
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