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Microfossils (Foraminifera and Calcareous Algae) of the Yamama Formation, Southern Iraq

The Yamama Formation is one of the important reservoirs, in southern Iraq. This formation in all studied wells consists of limestone and dolomitic limestone. Microfacies analysis clarified that the formation represented a ramp, inner, middle and outer environments, seventy-one species are recorded, the main fossils are composed of many genera and species related to main groups such as foraminifera, calcareous algae, and stromatoporids with few occurrences of gastropods, bivalves, bryozoa, spiculites and Echinoderms. The study has recorded 6 genera of foraminifera and 11 genera (green algae), 3 species related to Salpingoporella sp., 2 genera related to red algae, 1genera related to Charophytes (nonmarine plants) for the first time in the Yamama Formation.