The valley was carved by glaciers and the glacial deposits have provided good agricultural areas. On a tour trough the Siljan region one can see many traces of the last Ice Age, for example, polished grooves, glacial erratic's of various sizes, glacial flutings and potholes.//par
The two rock types, syenite and larvikite, dominate the exposures in Siljan. These rock types have consolidated from lavas far below the earth crust. 300 million years ago the area today is Siljan was full of volcanic activity and large fissures were formed. This period lasted for about 50 million years and resulted in what geologist today call the " Oslo rift".
Syenites and larvikites are both so-called "magmatic deposits", but they consist of unlike minerals and have different characteristics. These characteristics determine he appearance of the landscape. When larvikite breaks down, it gives a significant amount of nutrients to soil. This is obvious from the vegetation. Auenkollen consists of larvikitee low an rounded knoll with fertile vegetation.//par
Syenite, on the contrary, erodes quite slowly, and therefor contributes little nutrient to the soil. Skriua in Siljan is a typical knoll consisting of syenite. It has bare, steep rock side and sparse vegetation such as fir, juniper and heather.
Bygdeborgen «Børja» is situated on a lap in the lake Gorningen, from approx. AD 550
Øvrebøtjern is one of the Geo-sites in Siljan
Siljan is dominated by forested areas with knobby hills around a central valley, the…
The ironworks at Moholt started operations in 1731 as a subsidiary of the larger…
Henrik Ibsen was born in Skien on 20 March 1828 and his childhood home is just a few…
Gjerpen Church lies on the northern edge of Skien and is a beautiful romanesque stone…
1500 million of years of geological history.
Rock carvings offer a unique glimpse of a long-lost culture.
The iron age-house at Aarhus in Skien was opened in September 2005.
Brekkeparken is one lovely place to visit, beautiful garden and great views of the town…
The manor house at Søndre Brekke is truly magnificent.
Ecological herb farm with approx. 400 spices and medicinal plants.
The Ibsen Steps were restored in April 1995.
Snipetorp is Skien's oldest residential after the city fires in 1854 and 1886.
Telemark Kunstsenter (Telemark Art Senter) is a center of competence for professional…
Ibsenhuset is named after Skien's famous son, Henrik Ibsen.