In reply to UKH Articles:
Just been looking up the geology - not 'strata' actually (which are, basically, successive layers of rock laid on a seabed or similar) - I think we're talking about the Glaurus Thrust, where a slice of landscape (a nappe) has been shoved sideways across the top by the tectonic movements – in this case Italy being shoved northwards by the arrival of Africa. Wikipedia https://en.wikipedia.org/wiki/Glarus_thrust has a great pic of what I think is your 'magic line'. Equivalent in Scotland is the much older Moine Thrust shoving central Highland schist in over the top of the Torridonian. And while I'm being a know-it-all, the Tschingelhörner will be named after the dog Tschingel, climbing companion of English explorer William Coolidge.