Palynostratigraphy of the Kashafrud Formation in Senjedac Section, southeast of Mashhad

Category Paleontology and Stratigraphy
Group GSI.IR
Location 23th symposium on geosciences
Holding Date 05 May 2008

      The palynological investigation of the Kashafrud Formation in Senjedac Section has been done. This section which is situated in southeast of Mashhad, east of Fariman, contains of shale, sandstone and Conglomerate with a thickness of about 1651 meters. 50 samples of black shale and fine grain sandstone of this section selected and 250 palynological slides were prepared. In this study 47 species of spores (distributed among 30 genera), and 15 species of pollen (distributed among 8 genera) are particulary abundant (in contrast with dinoflagellates and fungal spores associated with foraminiferal test lining). 19 species of spore & pollen has been reported for the first time from Iran. Disappearance of Striatella seebergensis and appearance of Contignisporites burgeri indicate a Bathonian age for the upper part of the studied section and a Bajocian age for the lower part of the section, which corroborates the faunal (amonites contents) testimony. The presence of Converrucosisporites pricei, Osmundacidites senectus, Murospora florida, Retitriletes facetus, Sellaspora asperata, Concavissimisporites verrucosus Tuberculatosporites westbournensis testified this age determination. According to abundant presence of Klukisporites , Dictyophyllidites and compare with the zones which identified in Australia by Fillatof (Fillatof, 1975) with the name Dictyophyllidites Assemblage Subzone and in Iran & Afghanistan by Ashraf (Ashraf, 1977) with the name Ischyosporites variegatus - Duplexisporites problematicus zone a Middle Jurassic (Bajocian - Bathonian) age was proposed for this section. In Senjedac section 2 biozones (Striatella seebergensis Range Zone & Contignisporites burgeri Range Zone) were regionally established.