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Porsgrunn

Gea Norvegica Geopark, Porsgrunn

Gea Norvegica Geopark, Porsgrunn Photo: Gea Norvegica Geopark
Gea Norvegica Geopark, Porsgrunn Photo: Gea Norvegica Geopark

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Faults and zones of weakness

South of Porsgrunn, across Frierfjorden and further into Bamble by Herre, there is an extensive fault, the results of a period of earthquakes about 300 million years ago. This fault is clearly visible where the river "Ælva" run into a fault zone, and the city of Porsgrunn grew up along the river’s banks. If one looks further to the south, one sees that it sparkles from the many smaller water bodies that lie in the depression that the fault formed in the landscape. We can follow this depression all the way to Kristiansand.

In the Langesundsfjord-Eidanger area, there are many rare minerals. Many of these were first discovered and described here, and the occurrence are known among geologist in many parts of the world. One of these mineral is thorite, discovered in the 1928 at Løvøya. Thorite contains the until then unknown element thorium, which was named after the Norwegian god Thor.

As in Skien, many of the deposits in Porsgrunn are limestone’s that were formed at the bottom of a tropical sea about 450 million years ago. This limestone, which is full of fossils, is selected for industrial use for example by Norcem in Brevik. The limestone from Porsgrunn is used in cement, but generally it can be used for much else, for example, in plastics, paper and toothpaste.

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Gea Norvegica Geopark, Porsgrunn - Photo: Gea Norvegica Geopark

Gea Norvegica Geopark, Porsgrunn

Faults and zones of weakness South of Porsgrunn, across Frierfjorden and further into Bamble by Herre, there is an extensive fault, the results of a...

Gea Norvegica Geopark, Porsgrunn

Source: Visitnorway

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More about this area

Tourist information for Grenland

The tourist information office in Skien will help you plan your trip and book accommodation and activities in the Grenland area.

Where to eat in Grenland

Grenland offers a wide range of restaurants serving everything from international food to traditional Norwegian farmhouse cooking.

Where to stay in Grenland

Grenland offers a wealth of accommodation options: hotels, bed and breakfasts, private apartments, cabins and even a lighthouse.

Key facts about Grenland

Grenland is the southeastern district of Telemark, made up of the municipalities of Skien, Porsgrunn, Siljan and Bamble.

What to do in Grenland

Grenland has several waterparks and an indoor play centre. Take a trip on the Telemark Canal, join a fjord cruise or cycle along the coast.

Hiking in Grenland

The Coastal Path in Bamble is popular, as is the hike to Ulvskollen in Skien, but there are many other options if you want to walk in Grenland.
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