Stratigraphy and Palaeontology
JAVAD SAADATNEJAD
Abstract
Kalariz formation beds in Javaherdeh area has well exposure for plant macrofossils study. The studied area is located at the northern Alborz structural-facies zone, The Kalariz formation in Javaherdeh section consists of shale, siltstone, sandstone and conglomerate beds with coal veins and intrusive ...
Read More
Kalariz formation beds in Javaherdeh area has well exposure for plant macrofossils study. The studied area is located at the northern Alborz structural-facies zone, The Kalariz formation in Javaherdeh section consists of shale, siltstone, sandstone and conglomerate beds with coal veins and intrusive beds. It lies conformably, with a coarse grain sandstone bed, on top of the Laleband formation . Its upper contact is unconformable and sharp under the conglomerate beds of Javaherdeh formation. In this study 29 species of plant macrofossils from 13 genera were studied and introduced, including orders of Equisetales, Osmundales, Filicales, Cycadales, Bennettitales, Ginkgoales and Coniferales and an unknown reproductive organ. On the basis of the occurrence of index fossils such as Cladophlebis nebbensis, Nilssonia brevis, Dictyozamites asseretoi, Taeniopteris reversa, Taeniopteris tenuinervis and Baiera muensteriana Rhaetian age, and based on the occurrence of index taxa such as Dictyophyllum exile, Pterophyllum aequale and Pterophyllum bavieri, Late Rhaetian age is proposed for this assemblage. In this study, Ginkgoites whitbiensis from Iran and Taeniopteris reversa from Alborz are recorded for the first time. Clathropteris elegans, Nilssonia harrisi, Ginkgoites parasingularis and Ginkgoites lepida are recorded for the first time from Late Triassic beds of Iran
F Vaez-Javadi
Abstract
The East Yurt mine, SE Azadshahr, Golestan Province contains well preserved plant macrofossils containing nineteen species allocated to thirteen genera of various orders viz., Equisetales, Filicales, Cycadales, Bennettitales, Ginkgoales, and Coniferales. The plant macrofossils in this area are studied ...
Read More
The East Yurt mine, SE Azadshahr, Golestan Province contains well preserved plant macrofossils containing nineteen species allocated to thirteen genera of various orders viz., Equisetales, Filicales, Cycadales, Bennettitales, Ginkgoales, and Coniferales. The plant macrofossils in this area are studied for the first time. Based on the occurrence of Pterophyllum bavieri, Pterophyllum nathorsti,and Baiera muensteriana a Rhaetian age is suggested for this assemblage. Since, there was no differentiation between formations in geological map, these flora confirms spreading of the Kalariz Formation in this area. The East Yurt mine flora is correlated to the plant macrofossil assemblages of Minoodasht, Narges-Chal, Zirab, Tazareh, Ashtar, Abiek, and Jajarm (Alborz Mountains), Ghadir Member of the Nayband Formation in the Parvadeh mines (Tabas Block), and Darbid-Khun (Kerman Basin). Moreover, this assemblage evidenced in Europe (Germany, Austria, Sweden, Greenland, France, Denmark), China, Turkistan, and the Central Asia. Therefore, there were close floristic relationships between North and Central-East Iran (Kerman Basin and Tabas Block) and these area were palaeogeographically closely related, probably forming a uniform paleoenvironment and palaeoclimate during the Late Triassic. Furthermore, Iran was located at the Middle Asia Province among the Euro-Sinian Region of Vakhrameev climatic belt subdivisions and the South-western Region of Dubroskina’s subdivisions during this time.
