Peter W. SKELTON, Blanka Cvetko TESOVIC, IVO RADOVANOVIC, Katarina KRIZMANIC, Thomas STEUBER, Tvrtko KORBAR

Campanian pseudosabinia from the pučišća formation on the island of Hvar (Adriatic sea, Croatia)

Hvar adasındaki Üst Kretase karbonatları, Tetis’in orta bölümünde yer alan ve bir okyanus-içi platform olan Adriyatik karbonat platformunda çökelmiştir. Platformun Üst Kretase stratigrafisi, komşu Brač adasında ayrıntılı bir şekilde tanımlanmıştır. Hvar kasabası alanında, Dol Formasyonu’nun platform-içi derin denizel karbonat tortulları, Kampaniyen yaşlı Pučišća Formasyonu’nun (Brač mermer üyesi), bağıl olarak derin gelgit altı ortamında çökelmiş rudistli masif biyoklastik karbonatları tarafından üzerlenir. Pučišća Formasyonu’nun en üst bölümlerinde, Pseudosabinia klinghardti olarak tanımladığımız ve karmaşık kanallı iç kavkı yapısı ile tanınan, masif rudist kavkıları saptanmıştır. Kavkılar masif, açık gri-beyaz renkli, çoğunlukla rekristalize olmuş ve yer yer tebeşirimsi görünüşlü pelletli-biyoklastik istiftaşı-kabataş içinde yer alır. Makrofosil topluluğu, çeşitli radiolitidler, seyrek hippuritidler, plagioptychids ve inoseramid kavkılarından oluşur. Mikrofosil topluluğu indeks orbitoid ve siderolit türleri içerir. Mikrofosillerin stratigrafik yayılımları, stronsiyum-izotop stratigrafisi sonuçlarıyla da uyumlu olarak, Pseudosabinia düzeyinin Orta Kampaniyen yaşlı olduğunu gösterir. Bu nedenle bu düzey, Pučišća Formasyonu’nun Adriyatik karbonat platformunda bugüne değin saptanan en genç düzeyidir.

Hvar adasında (Adriyatik Denizi, Hırvatistan) Pučišća Formasyonu’nundan Kampaniyen Pseudosabinia’ları

The Upper Cretaceous carbonates on the Island of Hvar were deposited within the central Tethyan, intraoceanic Adriatic carbonate platform (s. str). The Upper Cretaceous stratigraphy of the platform has been described in detail from the neighbouring island of Brač. Following the intra-platform deeper-water carbonate sedimentation of the Dol Formation, the Campanian Pučišća Formation (the Brač ‘Marbles’ unit) in the area of the town of Hvar are characterized by massive bioclastic rudist-bearing carbonates deposited in relatively deeper subtidal environments. Within the uppermost part of the Pučišća Formation we recognized massive rudist valves, characterized by a complex canaliferous inner shell structure, and determined them as Pseudosabinia klinghardti. The valves are embedded in massive, light-grey to white, mostly recrystalized peloidal-bioclastic packstone to rudstones, characterized in places by chalky appearance. The macrofossil association comprises various radiolitids, rare hippuritids, plagioptychids and inoceramid bivalves. Microfossil association includes index species of orbitoids and siderolitines. The range of the microfossils, along with results of strontium-isotope stratigraphy, indicate the latest Middle Campanian age of the Pseudosabinia horizon. Thus, it is the youngest horizon of the Pučišća Formation in the Adriatic carbonate platform reported to date.

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