In Bollschweil in the black forest about 10 km southwest of Freiburg, amateur paleontologists Emil Blattmann and Rudolf Ritz discovered ice age bone depositions at the edge of the limestone pit Koch. They recovered numerous bones from a north-south sloping valley not far from the northwest edge of the pit, where limestone was being mined. Although their efforts took place under difficult conditions, they successfully recovered several dozen animal remains. The remains belonged to horses, rhino, a large bovide and mostly mammoths. Recovering bones and tusks, which were quite large and in a bad condition, posed a difficult task. Aside from animal remains, some stone artifacts were found.
After the Landesdenkmalamt was informed and it became clear that this site was soon to be destroyed by the limestone mining, the Universität Tübingen and the Landesdenkmalamt conducted a ten-week rescue excavation in fall 1997. In the months after the end of the excavation up until the end of 1998, Mr. Blattmann and Mr. Ritz, working with the Landesdenkmalamt, succeeded in saving further finds from destruction in Bollschweil.