Morter - St. Vigilius im Anger

The chapel St. Vigilius im Anger is surrounded by apple orchards - and not easy to find.
St. Vigilius im Anger is just like the Heiligkreuz-Kapelle in Müstair (40 kms west) an early triconch structure. The chapel in Müstair is dated via dendrochronological surveys to 775. It is claimed in Mortar, that St. Vigilius im Anger (once as well dedicated to St. Blasius) is even older, what I doubt. It is probably "pre-Romanesque".
An inscription inside says, that the chapel was consecrated in 1080 by Bishop of Trient (Trento). - The chapel was locked of course..