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Scandic Hotels – in all major cities from north to south
Nordic Choice Hotels – a different hotel company
Thon Hotels – with fantastic breakfast
Hostelling International – the door to Norway
Radisson Blu Hotels – discover your favourite destinations
Widerøe – the largest regional airline in Scandinavia
AutoEurope – always a smooth car rental experience
Vy express – travel with bus throughout Norway
DFDS – Europe’s leading ferry operator 2012-2020
Rent-A-Wreck – the smart car rental alternative
Arctic Campers – Norway’s camper van rental
NOR-WAY Bussekspress – travel green with express busses
Vy – it should be easy to travel green
Hurtigruten – "The World’s Most Beautiful Sea Voyage"
Authentic Scandinavia – exciting Norway tours
Up Norway – tailored journeys
Norrøna Hvitserk – expeditions and adventure holidays
Fjord Tours – experience Norway in a nutshell® with one ticket
50 Degrees North – unforgettable tailor-made and small group tours to Norway
Discover Norway – skiing, biking and hiking tours in Norway
Norwegian Holidays – low-price package holidays with Norwegian. Flight, hotel and rental car
DanCenter – your specialist in holiday homes in Norway
Norgesbooking – book your perfect cabin stay in Norway
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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