Abstract

Lower Jurassic successions of the Dinaric Carbonate Platform (DCP) margins were analyzed for sedimentology and fossil content at Trnovski gozd in Slovenia and at Rumija in Montenegro. The succession at Trnovski gozd (northern DCP margin) ranges in age from the Pliensbachian to the Aalenian and consists of: i) peritidal lithiotid limestone; ii) peloidal grainstone with oncoids; iii) brownish-reddish condensed limestone with hardgrounds; and iv) crinoidal-ooidal limestone. At Rumija (SW DCP margin) the most distal succession ranges from the Triassic-Jurassic boundary to the Aalenian and consists of; i) micritic limestone, directly overlying the Dachstein limestone; ii) fine-grained calcareous turbidites with chert, and a middle subunit of chert-free oolitic limestone; iii) marly limestone with radiolarians and sponge spicules; and iv) bioclastic limestone with abundant brachiopods. With two complementary sections, a depositional system of a southwest dipping carbonate ramp was reconstructed for the Pliensbachian: lithiotid limestone in the inner platform, oolitic lime-stone in mid-ramp and resedimented limestone with chert in outer-ramp setting. The Trnovski gozd succession is lithologically almost identical to the most proximal succession with lithiotid limestone at Rumija. Contrary to this, the outer-ramp limestone with chert has so far been documented only on the SW DCP margin in Montenegro. The first order transgressive-regressive cycle is clearly recognized in all sections, with the major early Toarcian transgressive peak being recorded in condensed facies with hardgrounds at Trnovski gozd, and marly limestone at Rumija. Regionally, the studied successions are correlative to formations of the western part of the Trento Plateau, i.e. to the Calcari Grigi Formation and the San Vigilio Group.

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