Plant megafossil systematic studies from Shemshak Formation of Abyek area, Gazvin
Subject Areas :معصومه Sohrabi-Molayosefi 1 , افسانه Hoseini 2
1 - گروه زمین شناسی، دانشکده علوم پایه، دانشگاه آزاد اسلامی واحد اسلامشهر
2 - کارشناس ارشد دفتر تنوع زیستی و ذخائر ژنتیکی سازمان حفاظت محیط زیست
Keywords: Central Alborz, Shemshak, Palobotanic, Retholiassic,
Abstract :
The main formations with coal resources are Shemshak and Hojedk in Iran. They have special plantmega fossils that show Rrhetian- Liassic geological age for Shemshak formation. Studied region islocated in the north of Abyek area. Shemshak formation with high development outcrops is formed ofsandstone, siltstone, shale and claystone. Abyek coal resources lie in central Alborz. Biostrtigraphicalcharacteristics of studied region belong to different ages. Outcrop of Precambrian formations torecent is available. The oldest formation is Kahar that lied down of Soltaniye formation.Paleoclimatologic investigations determined warm and humid ecology and semitropical environmentfor Shemshak formation. Most remaining of past plants are their leaves and main association contains9 genuses and 1 species that follows:Zamites sp., Otozamites sp., Anomozamites sp., Nilssoniopteris sp. Ctenis sp., Cycadites sp.,Nilssonia sp., Dictyophyllum sp., Cladophlebis sp., Pterophyllum bavieni.
