Stratigraphic Ranges of the Benthic Foraminifera and Microfacies of the Upper Maastrichtian-Paleocene Shallow Marine Carbonate Successions in the Eastern Pontides (Ne Turkey)

This study is a synthesis and reinterpretation of our previous works on microfacies and benthic foraminiferal assemblages of the Eastern Pontides Upper Maastrichtian-Palaeocene shallow water carbonate sequences. The aim of this study is to introduce relation between stratigraphic distribution of the foraminiferal assemblages and facies. The Upper Maastrichtian-Paleocene (K/T) transition is determined by the last occurence of predominant orbitoidal forms and by the first appearance of associations with miliolids, algae and bryozoans. The stages of the Paleocene are distinguished by means of miliolidal and rotalidal foraminifers. In the Upper Maastrichtian packed biosparite and rudistid-biosparite microfacies are predominant. Dolosparite microfacies can be used as key levels in the Upper Maastrichtian-Paleocene (K/T) transition and transitions between the Paleocene stages. In the Paleocene, biosparite rich in molluscan shell fragments, algal biosparite, miliolid biosparite microfacies are dominant. Many endemic taxa are exist through the Maastrichtian-Paleocene. Stratigraphic ranges of benthic foraminifera are of local importance.Original Abstract: Bu calisma, Dogu Pontidler'deki Ust Maastrihtiyen-Paleosen sig denizel karbonat istiflerinin mikrofasiyesleri ve bentik foraminiferlerin stratigrafik dagilimlari konularmda yapilan eski calismalarin sentezi ve yeniden yorumlanmasidir. Calismanin amaci foraminifer topluluklarinin stratigrafik dagilimi ve fasiyesler arasindaki iliskiyi ortaya koymaktir. Bolgede Ust Maastrihtiyen-Paleosen (K/T) gecisi, baskin olan orbitoidal foraminiferlerin bitisi ve miliolidal foraminiferler, alg, bryozoa birlikteliklerinin baslamasiyla belirlenir. Paleosen katlarimn ayirtlanmasmda miliolidal ve rotaloidal foraminiferler rol oynar. Ust Maastrihtiyen'de istiflenmis biosparit ve rudistce zengin biosparit mikrofasiyesleri hakimdir. Ust Maastrihtiyen-Paleosen (K/T) gegisinde ve Paleosen'in katlari arasindaki gegislerde Dolosparit mikrofasiyesi anahtar olarak kullamlabilir. Paleosen'de mollusk kavki kiriklarmca zengin biyosparit, algce zengin biyosparit, miliolidce zengin biyosparit fasiyesleri egemendir. Cok sayida endemik tur ve cins mevcuttur. Foraminiferlerin stratigrafik dagilimi bolgeye ozgudur.