ABSTRACT

The upper Palaeocene shallow-water carbonates of the Qorban member (Sachun Formation) in Iran are characterised by a well-diversified larger Foraminifera and green algae assemblages. A new ornatorotaliid species, Ornatorotalia pila n. sp., is described from such deposits. The age of the new taxon is assigned to SBZ4 (late Thanetian) by the co-occurrence of Daviesina langhami, Idalina sinjarica, Lockartia retiata and Dictyokathina simplex. This new record gives further evidences on the biogeographic expansion of throughout the Neo-Tethys during the Palaeocene-early Eocene. Ornatorotaliids were shallow-water dwellers taxa that thrived in both vegetated and unvegetated bottoms. Possibly, Ornatorotalia pila n. sp. rooted in the Selandian, likely related to a possible ancestor described in open nomenclature from the Central Apennines of Italy.

摘要

伊朗 Qorban 段（Sachun 组）的上古新世浅水碳酸盐岩的特征是多样化的较大有孔虫和绿藻组合。一个新的 ornatorotaliid 物种，Ornatorotalia pila n。sp.，是从这些存款中描述的。由于Daviesina langhami、Idalina sinjarica、Lockartia retiata和Dictyokathina simplex的共同出现，新分类群的年龄被指定为 SBZ4（晚塔尼提亚）。这一新记录为古新世-早始新世整个新特提斯的生物地理扩张提供了进一步的证据。Ornatorotaliids 是浅水生物类群，在有植被和无植被的底部都能繁衍生息。可能，Ornatorotalia pilan. sp. 植根于Selandian，可能与意大利中部亚平宁山脉的公开命名法中描述的可能祖先有关。