Clastic Rock Urn-Like Valley Landscape
Reference work entry
This type of landscape is associated with urn-like and bottle-like landforms. It is also called a bottleneck valley or hourglass valley. Urn-like valleys usually have a wide middle section but a narrow valley mouth. The cliff at the valley mouth is circular with a height of tens to hundreds of metres. In the Taihang Mountains, it is called a ‘Q’ valley because by backward erosion along the river tributaries, running water washes away the soft rock layer at the bottom of the cliff, and the thick quartzite layer collapses due to gravity. This type of valley wall is also called an ‘echoing wall’ due to its excellent acoustic effects. It is an important and popular tourism landscape. An example is the clastic rock urn-like valley in Zhangshiyan National Geopark in Hebei Province (Fig. 34).
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