Organ Pipes

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  Valley of the Organ Pipes near Twyfelfontein in Nothern Namibia

Boris Mascot advert, "some good info on these web-sites."

 

A Dolerite Dyke with a difference: If you are visiting the Twyfelfontein Rock Engravings you will also be checking out the Burnt Mountain, so the Valley of the Organ Pipes is a must stop off and see as it's in the area. The sides of the small valley are lined with rows of dolerite columns that have become known as the Valley of Organ Pipes. In this area about 125 million years ago the continent of Gondwana was breaking up. In many areas of Africa molten rock pushed up through the earth's surface. The shapes that formed here are a natural wonder and there are areas where the side walls of the dyke are collapsing and individual columns can be viewed and studied close-up.

 

The colors of the weathered rock are quite attractive under the correct sunlight conditions.  Best time for photographs is mid morning or mid afternoon. If you're too early or too late there will be shadows cast over the side walls.

 

Getting There: This is a tricky one as you can drive past it owing to it not being properly sign posted. As you drive along the D3254 you will tend to be looking for the Burnt Mountain which is on the right hand side of the road. Just before you reach the mountain on your left hand side you can see a small stone having hand painted directions to the ORELLPYPE (Organ Pipes). There is a small car park just off the D3254 road and below is the small valley of the organ pipes in which the polygonal rock columns can be viewed.

 

 

  
Organ Pipe end showing polygon shapes 1 Small road sign. Don't miss this View of Side wall of 'valley' showing the rows of 'organ pipes' 1  
     
Organ Pipe end showing polygon shapes 2 View of Side wall of 'valley' showing the rows of 'organ pipes' 2 View of Side wall of 'valley' showing the rows of 'organ pipes' 3  

 

Geometry - Seen to be Working: As the molten rock pushed up through the earth's surface it began to cool from the outer edges of the intrusion - inwards. The movement of the remaining innermost magma was restricted to 'vertical movement only'. As it cooled and contracted the rock split vertically forming columns that have polygonal cross sections in accordance with geometric law. The resulting formation leaves no voids between the columns.

 

Polygons applicable to this type of phenomena are Triangles, Quadrilaterals and Hexagons. They can be regular or irregular polygons. In this case the sides of the neighboring columns will be of similar length and shape, and they can even be curved as can be seen in the above left photo.

 

One familiar example of a regular polygon being used in nature is the hexagon as  used by bees when building their honeycombs.

 

Acknowledgements and further reading:  G1, G2, P1

 
  

Local Area Attractions and Articles of associated interest

  

► Burnt Mountain    ► Petrified Forest     ►  Twyfelfontein     ► Vingerklip    ►  Nearby Accommodation

 

  
   
  • A similar Geological Occurrence to the one in the Valley of the Organ Pipes can be seen at the Giant's Causeway in Northern Ireland.
  

 

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