Maturity of Mesozoic rocks in the Alpine-Dinaric transition zone is controlled by thickness of Cretaceous to Paleogene rocks.
Highest maturity is observed in the Slovenian Basin.
High vitrinite reflectance in Cretaceous sediments (up to 4.4 %Rr) is due to very thick Paleogene flysch sediments.
Uplift and cooling occurred between Late Eocene and Mid Oligocene time.
Thrusting postdates maturation.