Environmental Geology
- Gothenburg Northern Archipelago
Geology
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The Gothenburg area is highly affected by the quarternary glaciations which has eroded most of the tertiary surface sediments. The area has been ice-free approximately the last 10 000 years. In general the area is made up by clayfilled valleys sorrounded by bedrock ridges. The bottom sediments of the two estuaries are comprised mainly of fine postglacial clay and mud whith high organic content. The coastline is mainly bedrock but with different types of shores and coves inbetween.
The islands in the Gothenburg northern archipelago are mainly composed by 1,6-1,0 Ga metamorphic greywacke outcrops with some patches of postglacial sand and gravel deposits on the surface of the larger islands (SGU,2017).
Bedrock map modified from the SGU map generator. The rock types furthest to the west are mainly greywackes and to the east there are intrusive rocks.
Map of the marine sediments in the area, modified to show close up of our region of interest. (SGU, 2002)