Комплекси форамініфер палеоцену Північної України

Abstract

Some modifications for Biostratigraphic Scheme of Paleocene deposits of the Northern Ukraine as result of examination of foraminifera assemblages of the Dnieper-Donets Depression and Ukrainian Shield are proposed. In the Northern Ukraine section sediments of Psolian regional stage (regiostage) contain the most representative assemblages of planktonic and benthic foraminifera. Two planktonic foraminifers’ zones Subbotina trivialis – Globoconusa daubjergensis – Globanomalina compressa and Praemurica inconstans established earlier by M.V. Jartseva (1972) characterize the Psolian regiostage. Subbotina trivialis – Globoconusa daubjergensis – Globanomalina compressa zone corresponding to Eoglobigerina taurica and Globoconusa daubjergensis zones of the Belokamenskian regiostage of the Southern Ukraine is correlated with Danian zone P1 Eoglobigerina edita of tropical planktonic foraminiferal biochronological zonation. Praemurica inconstans zone of the Northern Ukraine corresponds to south Ukraine zone of the same name and is correlated with zone P2 Praemurica uncinata of Danian too. Benthic foraminifers’ assemblages from Psolian deposits have been distinguished as Cibicides lectus zone corresponding to Anomalina danica s. l. and Pyramidina crassa interregional zones of Danian and Zelandian of the south Russia and adjacent regions. Reviewed in the article biostratigraphical characteristics of local stratigraphic units of Psolian regiostage: the Sumy Suite of the Dnieper-Donets Depression (zones Subbotina trivialis – Globoconusa daubjergensis – Globanomalina compressa, beds with Cibicidoides lectus, beds with Cibicidoides favorabilis of the central part of the Depression; Anomalina danica zone, Ceratolamarckina tuberculata local zone, beds with Parasubbotina pseudobulloides and beds with Globoconusa kozlowskii of the north-eastern part of the Depression), Strata of quartz-glauconitic sands of the Konka-Yalyn Depression (beds with Parasubbotina pseudobulloides, beds with Cibicidoides lectus), the Luzanovka Beds (beds with Parasubbotina pseudobulloides, beds with Globoconusa daubjergensis, beds with Elphidiella prima) and the Polesje Beds (beds with Parasubbotina pseudobulloides, beds with Cibicidoides lectus), the Rajgorod Suite (assemblage with Anomalina danica) of the Ukrainian Shield. Correlation of these Suites, Beds and Strata are given. The Merlian regiostage of the Northern Ukraine contains not numerous foraminifers. Benthic foraminifers’ associations from the Merlian and Irzhavets Suites of the Dnieper-Donets Depression have been distinguished as assemblage with Bolivinopsis spectabilis. Sediment containing this assemblage is of Thanetian age by dinocysts. Findings of sporadic planktonic foraminifers in the Merlian deposits do not contradict this.