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Abstract
For the last 15 years a metal-foil core borer has mostly been used in Sweden to take clay samples for geochronological datings based on varve measurements. The foil core borer seems to be the most suitable instrument in exacting investigations, when the sampling depth is great and the lower varves are silty and unstable.
A simple sampling device, which can be handled by one person alone, has been constructed, and tested in a number of localities, where the clay depth was less than 4 meters and the lower varves tolerably stable. The sampler consists of a sheet-iron box and two U-shaped aluminum profiles, which are lowered into a hole dug through the clay down to the substratum by a 90-mm post-hole digger. The sheet-iron box is pressed into the clay by a wedge mounted on extension rods. Finally the box is cut free from the wall by a knife mounted on the wedge, and the sample is taken up to the surface. About two-thirds of a total of 25 samplings were successful. In the samples practically no disturbances caused by the device were noticed.