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Old 07-20-2012, 12:05 PM
 
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Las Gachas" in Santander department in the municipio of Guadalupe.






Un rio unico en el mundo - YouTube
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Old 07-20-2012, 12:23 PM
 
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Hrmm these are weird...I have never seen them before. Maybe some time of strange geological erosion? Odd that they are in stone and so round and so deep.
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Old 07-20-2012, 07:58 PM
 
Location: playing in the colorful Colorado dirt
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Looks like sinkholes to me.
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Old 07-20-2012, 09:44 PM
 
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Ancient volcanic erosion? there has to be a Geological explanation. There are too many other erosion patterns in the Rock! These are Volcanic vents? Look at the topography... these have exits down below? no?
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Old 07-20-2012, 10:02 PM
 
Location: Bedrolls now in NM and in TX.
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They look like collapse features in what appears to be sedimentary rock. There are probably caverns under the river. Parts of New Mexico are overlain with limestone and sedimentary rocks which occasionally collapse into a system of caverns below the surface. See for example Blue Hole at Santa Rosa. The whole town of Santa Rosa, New Mexico is built in a geologic sink feature. Several divers have lost their lives getting lost (sucked?) into the underground caverns that lie beneath Blue Hole.
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Old 07-20-2012, 11:36 PM
 
Location: Under the Redwoods
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I don't find them so strange.
Central America has lots of holes. The Mayan and Aztec got their water from underground aquifers, giant rivers that flow through lava tubes.
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Old 07-21-2012, 10:05 AM
 
Location: Limestone
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You see these all the time around man made dams, they are run off tubes to keep the level of the reservoir the dam created at a set level. When you see a large dam such as the Hoover dam release water those run off tubes is where the water comes from.
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Old 07-21-2012, 10:33 AM
 
Location: Under the Redwoods
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The holes in the video are not man made.
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Old 07-21-2012, 03:36 PM
 
Location: Limestone
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They could have been made by the water itself. You can see similar holes/depressions on the coast. When the water rushes over the bedrock it can take a rock or stone and gouge out those holes over a period of time. Most likely hundreds of years if not more. With a stone in one of those holes it can be pushed around in it and any debris washed out by the moving water. I'm not saying this is what happened but it is a possibility.
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Old 07-22-2012, 11:57 AM
Status: "Worried about our country." (set 26 days ago)
 
Location: Brooklyn,NY
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I say it's natural sinkholes. There are many strange natural phenomena, Like underwater lakes even.

Wait, What?: An Underwater Lake | Geekologie
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