Waldschratschacht / Bertmannhöhle

The Waldschratschacht lies about 15 m north of the road and is 25 m deep. The Bertmannshöhle lies immediately south of the road. In it, along a fissure zone running roughly N-S, a passage leads about 10 m steeply downward to the north and, behind a constriction (collapse), opens into a shaft that continues a few m upward and roughly 10 m into the depth. From this shaft, another passage leads in a southerly direction back beneath the entrance doline.

In April and September 2005, Prof. Feige, Münster, and cave researchers discovered two Schachthöhlen (shaft caves) here: the Waldschratschacht and the Bertmannshöhle. In a third doline, located somewhat farther south, the cave researchers, with the support of the district forester, attempted to expose the entrance of another suspected shaft.

The dolines are located in the distribution area of the fissured and karstified marly limestones of the Oerlinghausen Formation (Middle to Upper Turonian).