Writers : Ghavidel – Syooki, M.
Refference : Geosciences Scientific Quarterly Journal,No.:12,P.:28
Publishing Year : 1373

Abstract :

A total of 60 samples from the Ordovician sediments and Faraghan formation at Kuh-e-Surmeh in Fars province were selected and treated for palynological study, in order to determine more precisely their geological ages. 24 palynomorph taxa were identified in this study, including 10 acritarch, 10 chitinozoan, and 4 pollen species, which permit the recognition of two local ascending stratigraphic assemblage zones. Zone I appears in the Ordovician interval and represents the Upper Ordovician (Caradocian-Ashgillian). Zone II occurs through the Faraghan formation and suggests lower Permian (Fig.1). Therefore, there is a major hiatus between the Late Ordovician sediments and Faraghan formation at Kuh-e- Surmeh.
This hiatus includes the whole Silurian, Devonian, and Carboniferous strata and possibly coincides with the Caledonian Orogeny in the Zagros Basin of Iran. Diverse acritarch and chitionozoan taxa in the Late Ordovician strata suggest an open- marine environment for this sediments. However, the association of a few acritarch taxa with numerous pollen species in the Faraghan formation reveals a shallow marine environment for this rock unit.

Subject List : Palynostratigraphy