Bertle Rufus J. (2004) :
The Sedimentary Record of North Penninic Schistes lustrés of the Lower Engadine Window and its Correlation to the Tauern Window (Eastern Alps). Jahrbuch der Geologischen Bundesanstalt 144/2, 165-171
p.167: The “Gault Formation” is overlain by 10 m of phyllitised black shales (= Fuorcla
d´Alp Formation, BERTLE [2004]) of assumed uppermost early Cretaceous age corresponding most probably to an Oceanic Anoxic Event (OAE 1c and 1d, JENKYNS [1980]).