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We developed and improved methods to extrude sediment out of core tubes and to cut defined layers of sediment in the field. For extrusion we use standard connectable 50-cm sewage tubes or aluminum rods with two lines of holes vertically in equidistance of 0.5 or 1 cm. A stopper at the bottom of the core tube is placed on top of the extruder and the core tube is pushed downwards and stopped by distance...
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