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Burdigalian-Langhian foraminifera of the northwest High Zagros Thrust Belt, southwest Iran

Roozpeykar Asghar, Maghfouri Moghaddam Iraj, Yaazdi Mehdi, Yousefi Bijan

Geologos

2021

Vol. 27, No. 2

115--126

The foraminiferal contents of the lower–middle Miocene succession exposed in three sections in north Nur Abad on the northwestern side of the High Zagros Thrust Belt were studied. Assemblages of larger foraminifera from these sections can be referred to Zone SBZ 25 (and the Miogypsina globulus and Miogypsina intermedia subzones), which correlates with the Burdigalian Stage. For the first time, planktonic foraminifera documented from the Nur Abad area document Langhian deposits in the High Zagros, the upper 20 metres of the upper Sayl Cheshmeh section being characterised by the occurrence of planktonic foraminifera such as Globigerina concinna (Reuss), Globigerina diplostoma (Reuss), Globigerinoides obliquus (Bolli), Orbulina bilobata (d’Orbigny) and O.universa (d’Orbigny). This association characterises the Orbulina suturalis Interval Zone.

Species composition of testate amoebae (Protists) and environmental parameters in a Sphagnum peatland

Lamentowicz Ł., Gąbka M., Lamentowicz M.

Polish Journal of Ecology

2007

Vol. 55, nr 4

749-759

The research was made on the largest (ca 500 ha) peatland complex in the western Poland ("Chlebowo" mire) (N 52[degrees] 44'14.3" E 16[degrees]45'20.7"), that exists under considerable anthropogenic pressure. Species composition of testate amoebae in selected microhabitats was described. The fundamental environmental factors influencing the structure of assemblages were determined. Twenty four samples were taken from 10 sites (Sphagnum lawn, hollow and hummock) dominated by Sphagnum and brown mosses. Each of them was analysed in relation to its taxonomical composition. Nine environmental parameters (acidity (pH), conductivity colour, NH4[^+], NO3[^-], PO4[^3-], SO4[^2-], Ca[^2+] and [Mg[^2]) were measured in the field and laboratory. Thirty two testate amoebae species of 13 genera were identified within the 24 sites. In most of the sites species composition was dominated by Hyalosphenia papilio Leidy, Cyclopyxis arcelloides Leidy and Hyalosphenia elegans Leidy, however the most numerous were Amphitrema flavum Archer, Hyalosphenia papilio Leidy and Cyclopyxis arcelloides Leidy. The particular parameters, i.e. pH, depth to the water table (DWT) and So4[^2-] content significantly explained the species variability. Multivariate analyses showed that species tend to group especially along the pH gradient; to a smaller extent along the DWT and SO 4[^2-], together with pH.