The Pyrenean mountains, extending between the 42–43° lati-tude, today only retain very
small relic glaciers in the areas above 3000 m asl on their western part. However, the
Quaternary glaciation of the chain was considerable, but very unequal. On the northern
slope the equilibrium line altitude increases from 1200 m–1600 m W to E and more steeply
from N to S where it stands between 2100 to 2300 m. The north slope represent three fourths
of the formerly glaciated region. Thick and broad glaciers there reached down to 400 m at …