Fousing valley has many of the same characteristic features as the late glacial periglacial valleys that cut the Kronhede – Klosterhede outwash plain. However, in contrast to these valleys that exclusively drain westwards towards Nissum Fjord, Fousing valley drains both northwards to Venø Bugt in Limfjord, and southwards to a large marshy area that presumably drains further south to the Storå valley. An additional special feature of Fousing valley is that the valley floor lies at a higher level (about 10 m) than the valleys that cut through the outwash plain further west, and about 5 m higher than the Trælborg Valley (site 22) further to the north.
The northern part of the site is coincident with Kilen (site 14). Modification of the landscape by ice and meltwater here has resulted in a terrain with large gentle hills and steep slopes. The landscape is most dramatic in the Kilen area and becomes less striking in the small valleys that cut down into the flatter terrain.
The narrow, northern part of the Fousing valley valley contains protected types of nature: marshes, meadows and heaths. That part of Fousing valley that overlaps with Kilen is protected by conservation. There is a large concentration of barrows, and the cultural heritage “Ancient Road”, that extends along the MSL from the North Sea at Trans in the west to river Karup Å in the east, passes through the area. The broad, southern part of the site that is drained for agricultural purposes has fewer registered areas of natural interest.
Interesting elements of the landscape along the cliff are several marked erosional gullies (Fig. 1-4). These were originally formed by large landslips but have become the course for running water (seepage of groundwater or drainage) that has eroded deep into the soft sediments. This kind of landscape is unique in the geopark and is seldom developed in low-lying Northwest Europe. The layers in the cliff consist of till and meltwater deposits. The oldest deposits in the cliff occur at Fjaltring where meltwater clay has been referred to the Elsterian glaciation. Equivalent deposits are found at several other localities in the geopark (e.g. Odby, Toftum). Between Trans and Ferring there are three different tills: lower, middle and upper.