Title of article :
On certain Neocomian – Aptian calcareous algae in the West of Kopet Dagh (NEIran) – Systematics and compared biogeography, focusing on Dasycladales
Author/Authors :
Fateh Bahari ، Leili Department of Geology - Faculty of Science - Ferdowsi University of Mashhad , Gharaie ، Mohammad Hosein Department of Geology - Faculty of Science - Ferdowsi University of Mashhad , Barattolo ، Filippo Dipartimento di Scienze della Terra - Dipartimento di Scienze della Terra , Conrad ، Marc Andre 71 chemin de Planta , Muossavi Harami ، Reza Department of Geology - Faculty of Science - Ferdowsi University of Mashhad , Mahboubi ، Asadollah Department of Geology - Faculty of Science - Ferdowsi University of Mashhad
Pages :
20
From page :
115
To page :
134
Abstract :
In Western Kopet Dagh, the lower Cretaceous carbonate series contains distinctive assemblages of calcareous algae, chiefly Dasycladales which are primarily studied in this work. Based on the significant presence of certain species, the Zard Formation, assigned to the Valanginian and, in its upper part, to the Hauterivian or base of the Barremian, is subdivided into two intervals, respectively A and B. Higher up, the Urgoniantype Tirgan Formation, assigned to the Barremian and Lower Aptian, is subdivided into intervals C and D. On this occasion, the taxonomy and systematics of 17 species of Dasycladales and one incertae sedis found in the series are discussed, in relation to some recent standpoints. Out of this inventory, the biogeographic distribution of 11 species is particularly interesting. During the Lower Cretaceous, the Kopet Dagh region was quite isolated, northeast of the Izanca, a branch of the Tethys. Assemblages encountered in this region are compared with other areas, encompassing Iberia to the northern margin of West Gondwana. Finally, the stratigraphic and/or biogeographic distribution of two species appears to be partially related, in one case to the Valanginian OAE1 event, in another case to one or more obstacles in relation to the paleotectonic context.
Keywords :
Early Cretaceous , Microfossils , Calcareous Algae , Kopeh , Dagh basin
Journal title :
Geopersia
Record number :
2501272
Link To Document :
بازگشت