Appearance of the peat bog landscape

At the end of the Quaternary Period, the Jura was covered by a huge glacier. Reindeer and mammoths were abundant. This mass of ice changed the relief and broke and moved rocks. When it melted, the ice left glacier moraines in the watertight rocky holes left behind.
At the bottom of the depression, a lake later took shape, fed by the water from the melting glacier, from rainfall and from streams. Before long, the climate started to warm up. Aquatic plants quickly developed and organic matter accumulated. The lake filled and turned into a marsh.