بازدید:23093 بروزرسانی: 06-12-1399
Vaez Javadi, F. and Abbassi, N.
Study of plant macrofossils from Baladeh area (Central Alborz): dating and biostratigraphy
معرفی ماکروفسیلهای گیاهی منطقه بلده (البرز مرکزی) ، تعیین سن و بیوستراتیگرافی آنها
The Shemshak Group is well-exposed and spread in the Baladeh area (Central Alborz). 22 macrofossil species allocated into 14 genera of various orders such as Equisetales, Filicales, Bennettitales, Cycadales, Ginkgoales, Czekanowskiales and Coniferales are identified. Two asseblage biozones are recognized. Assemblage zone I is established based on Ptilophyllum minor and Klukia exilis, and assemblage zone II is recognized according to Coniopteris hymenophylloides and Ptilophyllum harrisianum. Furthermore, on the basis of presence of index fossils such as Equisetites columnaris, Coniopteris hymenophylloides, Klukia exilis, Nilssonia macrophylla and Ptilophyllum minor the Early to Middle Jurassic age (?Hettangian-Toarcian to Bajocian) is suggested for these sediments.