BIOSTRATIGRAPHY OF THE BARTONIAN DEPOSITS FROM GILĂU AREA (NW TRANSYLVANIA, ROMANIA)
BIOSTRATIGRAPHY OF THE BARTONIAN DEPOSITS FROM GILĂU AREA (NW TRANSYLVANIA, ROMANIA)
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吉鲁地区巴托尼亚矿床的生物地层学（罗马尼亚特兰西瓦尼亚西北部）
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发表时间：
2004
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通讯作者：
M. Melinte
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作者：
A. Rusu;Despina Brotea;M. Melinte
本文对西北特兰西瓦尼亚地区巴尔顿期（中始新世）沉积（cpusu组、Inucu组、vleni灰岩和Ciuleni组）中发现的软体动物、大型有孔虫、底栖和浮游有孔虫以及钙质纳米化石进行了生物地层学研究。软体动物可分为3个类群，分别为：Pycnodonte bronniarti、Sokolowia eszterhazyi、Ostrea bersonensis和Cubitostrea orientalis。SBZ 17（下巴顿统）和SBZ 19（下普里亚盆统）标准带具有较大的有孔虫特征。Nummulites perforatus层存在于下巴尔顿期。底栖有孔虫被划分为局部生物带Pararotalia calveze、Pararotalia subinermis和Pararotalia lithothamnica。cunipusu组上部浮游有孔虫属Morozovella lehneri带（P12）。钙质纳米化石组合被划分为disaster tani nodifer （NP16）、disaster saipanensis （NP17）和Chiasmolithus oamaruensis （NP18）带。Lutetian/Bartonian边界位于与纳米化石Reticulofenestra tokodensis华相对应的Pycnodonte brongniarti水平之上（在NP16带内）。在Ciuleni组的末期，首次出现的Priabonian nummulites（位于NP18纳米化石带内的生物事件）可以近似地描述Bartonian/Priabonian的边界。
The present paper focussed on the biostratigraphy of the mollusks, larger foraminifers, benthonic and planktonic foraminifers as well as on calcareous nannofossils, identified in the Bartonian (Middle Eocene) deposits (Căpusu Formation, Inucu Formation, Văleni Limestone and Ciuleni Formation) of the NW Transylvania region. The mollusks could be grouped in three assemblages, with the following ostrein horizons: Pycnodonte brongniarti, Sokolowia eszterhazyi, Ostrea bersonensis and Cubitostrea orientalis. The larger foraminifers are characteristic for SBZ 17 (Lower Bartonian) and SBZ 19 (Lower Priabonian) Standard Zones. The Nummulites perforatus Level is present in the Lower Bartonian. The benthonic foraminifers were assigned to the local biozones Pararotalia calveze, Pararotalia subinermis and Pararotalia lithothamnica. The planktonic foraminifera, identified from the upper part of the Căpusu Formation belongs to the Morozovella lehneri Zone (P12). The calcareous nannofossil assemblages were assigned to the Discoaster tani nodifer (NP16), Discoaster saipanensis (NP17) and Chiasmolithus oamaruensis (NP18) Zones. The Lutetian/Bartonian boundary is placed just above the Pycnodonte brongniarti Level corresponding with the bloom of the nannofossil Reticulofenestra tokodensis (within the NP16 Zone). The Bartonian/Priabonian boundary could be approximated by the first occurrence of the Priabonian nummulites (bioevent placed within the NP18 Nannofossil Zone) toward the terminal part of the Ciuleni Formation.