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Kinnekulle Earthcache

A cache by Thoto Send Message to Owner Message this owner
Hidden : 06/10/2010
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Size: Size:   not chosen (not chosen)

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Geocache Description:

Kinnekulle Earthcache

I would be very thankful if you could write you email and log in English. Nevertheless also Swedish email/logs are welcome.

This earthcache would like to bring you to the top of Kinnekulle. Kinnekulle is a hill or ridge in the province of Västergötland, Sweden, It is located on the eastern shore of lake Vänern. Its highest point is 306 metres above sea level.

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From a geological standpoint you could say that Kinnekulle is one of the plateau mountains in Västergötland that is composed of several layers of different types of rock. In the past, it was thought that Kinnekulle was an old volcano, but that is not the case. The skittle shape of the mountain has instead been sculpted by ice, wind and water since the last Ice Age.

The rock layers of Kinnekulle are actually made up of the ancient sea bed. The mountain was created some 520 to 400 million years ago, when the land mass that is now Sweden was under the sea. Enormous amounts of sand, clay, sludge and dead plants and animals fell down and gathered on the sea bed. Over a period of millions of years, this material was then compressed and eventually hardened to become stone.

The most important rock layers in Kinnekulle are sandstone, alum-shale, lime-stone, clay slate and diabase. This earthcache would like to set its focus on diabase, the rock that forms the summit of Kinnekulle.

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So why is Kinnekulle’s geology different from the geology in the landscape round about? In the past, the sedimentary rock types – sandstone, alum-shale, limestone and clay slate – were far more dominant. They have, however, eroded everywhere apart from Kinnekulle and the other table mountains in Västergötland. The reason for this is that, at the very top, the table mountains have a layer of solidified magma, otherwise known as diabase. Diabase or Dolerite is a mafic, holocrystalline, subvolcanic rock equivalent to volcanic basalt or plutonic gabbro which forced its way out of the earth’s core some 280 million years ago. In North American usage, the term diabase refers to the fresh rock, whilst elsewhere the term dolerite is used for the fresh rock and diabase refers to altered material. Diabase dikes and sills are typically shallow intrusive bodies and often exhibit fine grained to aphanitic chilled margins which may contain tachylite (dark mafic glass). It is extremely hard and it has therefore protected the underlying layers of rock from being eroded by wind and weather.

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To log this earthcache, perform the following tasks:

  • Start your walk at N58° 35.870 E13° 24.891. There you find several information boards. Use the to answer the following questions:
    • Which rock layer do you find at Blomberg?
    • Which rock layer has got the largest spread?
  • Go to above coordinates. Here you find a great viewpoint as well as additional information about the area. Please take optional a photo of you or your GPS at the top of the viewpoint. In the case the viewpoint is closed go to N58° 36.109 E13° 24.463 and take a photo there.
  • Go to N58° 35.998 E13° 24.296. There you have a nice view as well and you find the following big diabase. Measure the width of the stone!

    Click for enlargement

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