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Herdla – glacial deposits
The shift in the landscape is striking between the barren craggy moors north on Askøy and the green fields of Herdla, which has the county's biggest farm. The majority of Herdla, such as the island appears today, is a gift from the glacier: The glacier that advanced here over 12,000 years ago stopped at the northern tip of Askøy and took its time building up the moraine on Herdla. Since then, Herdla has been under continual transformation. The re-organisation of the loose sediment deposits continues today.
Kvalvikane
In Ålvik quartz has long been used to produce ferro-silicon. The quartz was collected from the other side of the fjord, from the mountainside above Kvalvikane.