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Paleokarst and associated sediments at Dubci geosite in Dalmatia, Southern Croatia

This poster presents preliminary results of sedimentological study of Dubci bone-breccia site as an update to former research. The study site is located on the saddle between the mountains Omiška Dinara and Biokovo, 404 m above modern sea level. It was discovered already at the end of the 19th century during road construction between Makarska and Zadvarje. The road cut exposed a cross section through a paleocave buried with coarse clastic sediments in alternation with paleosols. The Dubci site is faunistically dated as of Cromerian age. It is one of several Lower Pleistocene sites in Dalmatia with bone breccias rich in fossil skeletal elements of macro- and micro mammals. Detailed geological context of the Dubci site was first described by Malez (1967). More recent study of the site indicates even more complex origin of this paleocave and associated sediments, which comprise three sedimentary units: unit 1)lacustrine, unit 2)paleocave and unit 3)alluvial. New sediment samples revealed presence of well preserved ostracod fauna, glass spherules and microtectites of probable impact origin, black glass shards and lava-like carbonaceous particles, rare microscopic fish bones, locally frequent benthic and pelagic foraminifers, and particles of various allochthonous lithologies, which all give new input for interpretation of the Dubci site. Considering the new data, it is likely that sedimentation and geological events occurred in much longer time span than just Cromerian, which equates only to Günz-Mindel Interglacial of the European Alpine region.

karst; paleocavern; Dubci; Biokovo Mt.; sediments

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