Upper part of core 502 (with bottom water on top) from a depth of 42 m, north of Örskär in the south-western part of the Bothnian Sea. Variations in the film density along the centreline of the radiograph was recorded by a Joyce-Loebl 3CS microdensitometer.

A considerable time gap in the sedimentary sequence due to erosion is exemplified by the upper part of this radiograph, showing an erosional surface capped by a mainly sandy and partly gravelly top layer.

Stereoradiographs of sandy and gravelly storm layers in the predominantly clayey core 502. Core depth: 19-41 cm.

Try to study the stereoradiographs without the help of a stereoscope. Start with your nose close to the monitor, pull your face slowly away from it, and look through the image.

In order to take these stereoradiographs, the coring tube and its holder were moved 62 mm horizontally at a film-to-focus distance of 1.0 m.

Click here to get a better resolution of the stereoradiographs.

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