Dr. Evan J. GowanAndersen et al investigate the in-situ cosmogenic isotopes from Gaustatoppen Mountain in southern Norway. The amount of cosmogenic isotopes in the rocks can be used to tell how long the mountain was buried by ice from the Scandinavian Ice Sheet.
They conclude based on ¹⁴C, they conclude the mountain was covered for at least 20-25 thousand years during the LGM. The inheritance signature of cosmogenic ²⁶Al and ¹⁰Be indicates a substantial erosional event during the penultimate glacial cycle.