The landmass of Monti della Laga has a more rounded off characteristic in comparison with many of the other Apennine areas. This phenomenon is because the soil is far more arenaceous (sandy) and has marble formations that are not found in other parts of the central Apennine Mountains farther to north and the south. Hence the geological name given to the area, Formazione di Laga. More characteristic of the Apennine mountains are soils, rocks, and land formations made up of coal and dolomitic limestone.