Dillsgraben, Natural sinkhole in Königsdahlum, Hildesheim, Germany.
Dillsgraben is a large sinkhole in Königsdahlum, Hildesheim, formed as a circular depression in the landscape with steep sides surrounding the main cavity. Water pools at the bottom from groundwater seepage, and the slopes are covered with trees and vegetation that stabilize the earth.
The sinkhole formed about 1000 years ago when underground caves collapsed as water dissolved the rock layers beneath the surface. This process occurred in the gypsum rock beds of the Middle Muschelkalk formation where groundwater erosion weakened the structure.
The geological formation functions as an educational site where students and researchers study the natural processes of karst landscapes in Germany.
The site is accessible year-round and offers views of the sinkhole from the surrounding slopes, which provide safe vantage points for observation. During heavy rain the water level rises quickly, so it is helpful to check weather conditions before visiting.
The sinkhole's exceptional size suggests potential salt intrusion from the Zechstein formation during the uplift of the Rhüden salt dome.
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