Bothnian Sea
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.
Radiographs of the uppermost part of cores EB1 and HD from a depth of 130 m in the southern part (station no. 190) and from a depth of 200 m in the northern part (station no. 192) of the Bothnian Sea respectively.
Biogenic structures dominate in these cores. As shown by the radiographs the sedimentary structures in core EB1 are very similar to those in core HD.
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