resediments
from the crater walls and mud flows from the surroundings
were deposited there as well. Clay forms the autochthoneous
background sedimentation (Gaupp and Wilke 1998).
The duration of the lithozone C/D was calculated by
Milankovich cycles to be 220,000 years (Herrmann 2007).
The youngest lake sediments can be assigned to terrestrial
mammal stage MP28 (Storch et al. 1996).