Kassab, I. I. M. (1976). Some Upper Cretaceous Planktonic Foraminiferal Genera from Northern Iraq. Micropaleontology. 22(2): 215-238.

358801

10.2307/1485401 [view]

Kassab, I. I. M.

1976

22(2): 215-238

Publication

Fifteen species, one of which is new, of the genera Hedbergella Brönnimann and Brown, 1958, Loeblichella Pessagno, 1967, Abathomphalus Bolli, Loeblich, and Tappan, 1957, Globotruncanella Reiss, 1957, emend. Pessagno, 1967, and Rugoglobigerina Brönnimann, 1952, are discussed. The definition of the genus Loeblichella Pessagno is emended to include the meridionally arranged rugosity character which was observed on L. hessi (Pessagno) and L. carteri, n. sp. Based on apertural and umbilical characters the validity of the general Hedbergella, Globotruncanella, and Rugoglobigerina is questioned. The planktonic foraminiferal species concerned are discussed in detail and their evolutionary relationships, morphology, and geographic and stratigraphic distribution are investigated. The genera concerned are reported from the upper Campanian-Maastrichtian Shiranish and Tanjero Formations of northern Iraq. The genera Abathomphalus, Globotruncanella, Hedbergella, and Loeblichella were found to be rare in the sections studied; however, some of the species were found to be relatively abundant and confined to certain stratigraphic horizons. The genus Rugoglobigerina is abundant, and some species were observed in short stratigraphic intervals throughout the successions concerned.

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