During the subsequent Weichselian glaciation – only about 10,000 years ago – the ice sheet could not cover the hill due to its height, it could only flow around it, and it therefore formed a nunatak.
The subsequent Weichselian glaciation, occurring around 10,000 years ago, resulted in the ice sheet being unable to completely cover the hill due to its height. This led to the creation of an isolated peak, or nunatak, as the ice flowed around it.