Palynostratigraphy of Late Visean – Serpukhovian from Borehole Akkas-1, Western Iraq.

Abstract

The present study depends on (9) samples of the stratigraphic section between the depths (1120.5-1197) m from Akkas-1 borehole, western Iraq. These samples yielded enrichment of well-preserved Miospores except for one sample at (1178) m, which is of poor preservation.These samples yielded (129) species of Miospores belonging to (57) genera, and (16) species are expected to be new species. The Index species of the studied stratigraphic section indicate Late Visean - Serpukhovian age including:Aratrisporties saharaensis, Kraeuselisporites ornatus, Colatisporites denticulatus, C.decorus, Rotaspora knoxi, Prolycospora rugulosa, Spelaeotriletes spp., Vallatisporites spp. Savitrisporites nux, Waltzispora polita, W. planianulata, Raistrickia accincta, R. nigra. The sedimentary basin of these samples was promoted by the swampy and Lagoon ecosystem and the presence of some acritarchs indicating a periodic connection with the sea. The ferns of the plant's group Petridophyta include the presence of genera:  Vallatisporites, Kraeuselisporites, Densosporites, Raistrickia, and Spelaeotriletes, which belong to herbal lycopods within the group of ferns, give us a conviction of the presence of forest conditions adjacent to the swamps