Naslov
Decastronema barattoloi (De Castro), characateristic fossil of the Palaeocene ad the Eocene peritidal sediments from the Adriatic carbonate platform

Autori
Ćosović, Vlasta ; Drobne, Katica ; Ogorelec, Bojan ; Moro, Alan ; Koić, Mladen ; Šoštarko, Ivan ; Tarlao, Alceo ; Tunis, Giorgio

Izvornik
Geologia Croatica (1330-030X) 61 (2008), 2-3; 321-332

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Decastronema barattoloi; Adriatic carbonate platform; Paleocene; Eocene; Peritidal Environment

Sažetak
The renewed deposition in the Paleogene and the oldest part of the non-interrupted Paleocene succession is characterized by presence of Decastronema barattoloi (De CASTRO), cyanobacterial tubes originally described in the Apennines. The reinterpretation of limestones from several sections located in the Kras region (NW part of the AdCP: Basovizza, Dolenja vas, Sopada, Čebulovica) confirmed the presence of these microfossils in peritidal sediments of Danian age (SBZ 1). The Cuisian (Late Lower Eocene) sediments, from eastern Istria (Brnjci section), Cres Island (Koromačna Cove section) and Ravni kotari (Benkovac - Korlat section) contain, in great numbers, individuals of this species. The cyanobacterial tubes are scattered in laminated, fine grained mudstones and wackestones, immediately above the Cretaceous sediments (occasionally above bauxites or breccias). The Decastronema-bearing sediments pass upward into the Foraminiferal limestones of Cuisian age (SBZ 11, based on conical agglutinated foraminifera and alveolinids), allowing age attribution of the cyanobacteria remnants. The Paleocene specimens are minute (up to about 180 μ m), thick walled tubes that occur with the index fossil Bangiana hanseni DROBNE. The Eocene forms accompanied by ostracods, pelecypods, and miliolid and rotaliid foraminifera are segmented tubes, up to 400 μ m long and usually thin walled.

Izvorni jezik
Engleski

Znanstvena područja
Geologija

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