Swedish cave
In 1809-13, the northern coast of Furs echoed Swedish glosses. Under the direction of a Swedish miner, a mine was in the process of digging into the mole cliff, which has since been named Stolleklint. Stolle means mining. After the defeat of the Napoleonic Wars, Denmark had lost Norway, which had hitherto supplied Denmark with fuel and raw materials. Therefore, people began to look for coal in Denmark, and the black layers in Fur's piers aroused interest. Was it hard coal? The mine was dug about 50 meters into the cliff, and in the end a deep well was dug, but all in vain. Today the mining corridor (Svenskehulen) is gone, as the fjord in 200 years has eaten about 50 meters of the cliff. Only the place name Stolleklint is left.
But why dig for coal at Nordfur? Until 1902 it was believed that the ash layers (see more under History) were coal. By 1883, two Belgian geologists had otherwise pointed out that the black lines were not sand layers with coal but volcanic ash layers.
Today we know about 200 ash layers at Fur. The 179 (all over ½ centimeter) have been numbered. 140 of the teams have positive numbers, while 39 have negative numbers. The reason for the different numbers is because there is a strong divide by ash layer number +1 and that the researchers do not know the extent of layers underground.
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