The Verbano Cusio Ossola Province is located in the central western Alps and has had great importance for geological studies about the Alps since the last century.
The Alps are a double-vergent chain : an European one and an African one, the southern Alps divided by an important tectonic line named Lineamento Periadriatico or Insubric Line...

Domodossola
The beolas is the most practical and right material for the local building trade (but not only), and this is efficiently demonstrated by every local administration in the valley.
Domodossola has a concrete example: all pedestrian walkways were built using beolas; the oldest buildings too are, totally, built with beolas. Beolas were used for walls, gardens, building balconies, terraces, shelves, doors and windows frame and even rooves.