Visualize and interpret the geometry, heterogeneity and lateral ...

4.1.1 Channel body 1 (Northern channel)Channel body 1 is situated on the northern most part of the island (Figure 4.1 and Figure 4.2).It has a maximum thickness of around 36 meters and is approximately 1 km wide in theexposure. The channel body can easily be spotted on both sides of the island. The channelbody is displaced by a steeply dipping normal fault, with a displacement of about 50 meterson the eastern side and only 18 meters on the western side of the island (Figure 4.1 and Figure4.2). The channel body is clearly cutting into the underlying sediments, with a maximumdown cutting of about 17-20 meters. By studying the pinch outs seen on this channel body onecan clearly see that they are pinching out into fine- grained sediments (Figure 4.1D-G andFigure 4.2 D-G). By looking at the photos, the channel body appears massive and withoutany erosional scours. However, as marked on Figure 4.1C, some layers are dipping towardsthe south.In this area it is not easy to see the clear black interval that marks the Hopen member, but asshown in Figure 4.1 and Figure 4.2, the Hopen member is most likely situated between thedotted black line and the solid black line, which marks the beginning of the Hopen memberand the Slottet Bed respectively. This indicates that Channel body 1 is depositedapproximately 60 meters below Hopen member.(1) DiscussionThe massive character of the channel body indicates deposition by a single channel, hence thechannel body is single-story, where the dipping surfaces are indications of lateral accretion.This interpretation is supported by Klausen and Mørk (submitted).The log from this section only covers the lower portion of the channel body, but it is stillvaluable for explaining some of the dominating processes responsible for creation of thechannel body. The sedimentological log is indicating fine- medium grained sandstone, with ahigh sand/shale ratio. The channel body cuts into and rest on overbank fines characterized byshaly coal and carbonaceous shale, with abundant plant fragments (Klausen and Mørk,submitted).29