Jurassic Palynostratigraphy of the Karim-Abad section, North of Bahabad, Yazd Province: Relative abundance and SEGs Analysis

Jurassic deposits are well spread in the north of Karim Abad village, north of Bahabad, central Iran. These deposits contain 41 species of palynomorphs, in which 15 spore species (12 genera), 15 pollen species (10 genera), and 10 species of dinocysts (3 genera) were identified. Vertical distribution of miospores allows erection within the Hojedk Formation of one biozone–Klukisporites variegatus- Chasmatosporites apertus Interval zone based on the FOO and LOO of selected taxa. Moreover, vertical distribution of dinoflagellate cysts allows erection within this formation of one biozone- Nannoceratopsis triceras-Nannoceratopsis gracilis Assemblage zone. The relative abundance of dinoflagellate cysts, spore, and pollen is 86.21%, 7.2%, and 6.6%, respectively. Therefore, the relative abundance of dinoflagellate cysts was high and the marine environment was prominent in this area during Jurassic sedimentation. Based on relative abundance of miospores' parent plant fossils, ferns, cycads, and conifers are 37%, 31.5% and 11.82%, respectively, and related sporomorph ecogroups (SEGs) indicate that they occurred in different environments such as upland, wetter / drier lowland, river and coastal with temperate-sub-tropical and humid climate.