Composition and importance of Upper Triassic (Upper Ladinian – Lower Carnian) breccia in stratigraphy of External Dinarides

A sequence of boulder breccia, separated by several emersion horizons is recognized as part of the Upper Ladinian – Lower Carnian Cassian Dolomite and Limestone Formation in the area of Medvedica (central Slovenia). The composition of clasts, determined from thin sections in the context of Late Ladinian – Early Carnian platform models suggests their origin in the transition between the inner platform/lagoon and the back-reef area, alternatively in the internally differentiated lagoon with swells. The emergence of the platform is suggested to correspond to the upper sequence boundary of the Car1 depositional sequence from the Southern Alps. The platform growth subsequently continued until the uppermost Julian, when the second emergence (upper sequence boundary of the Car2 depositional sequence) finally terminated the growth of the Cassian platform.

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