Biostratigraphy and palaeogeography of Late Ordovician chitinozoans from the northeastern Alborz Range,Iran |
| |
Institution: | 1. Exploration Division of N.I.D.C., Teheran, Iran;2. Centre for Ecostratigraphy and Palaeobiology, Department of Earth and Planetary Sciences, Macquarie University, Sydney, NSW 2109, Australia;1. Departamento de Estratigrafía y Paleontología, Universidad de Granada, Spain;2. Departamento de Geología, Universidad de Jaén, Spain |
| |
Abstract: | Chitinozoans were extracted from Upper Ordovician strata in the northeastern Alborz Range (Kopet Dagh Region); 31 chitinozoan species are recorded. Four successive biozones are recognised within the Ghelli Formation, viz. Tanuchitina fistulosa, Acanthochitina barbata, Armoricochitina cf. nigerica and Ancyrochitina merga biozones. Correlation of these biozones with those of the North Gondwana Domain suggests that the middle and upper parts of the Ghelli Formation range from Late Caradoc to mid Ashgill. The number of species in common with the North Gondwana Domain suggests a close relationship between Iran and North Gondwana. However, there are a number of cosmopolitan species occurring in the Ashgill. Three new species are described: Armoricochitina alborzensis, Armoricochitina iranica and Ancyrochitina persica. |
| |
Keywords: | |
本文献已被 ScienceDirect 等数据库收录! |
|