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H. R. Thierstein, “Late Cretaceous Nannoplankton and the Change at the Cretaceous-Tertiary Boundary,” In: J. E. Warme, R. G. Douglas and E. L. Winterer, Eds., The Deep Sea Drilling Project: A Decade of Progress, Special Publications of SEPM, The Society of Economic Paleontologists and Mineralogists, Tulsa, 1981, pp. 355-394.

has been cited by the following article:

• TITLE: Late Maastrichtian Calcareous Nannofossil Biostratigraphy and Paleoecology of the Tamera Well, Siwa Area, Western Desert, Egypt

  AUTHORS: Esam Zahran

  KEYWORDS: Formation; Nannofossils; Micula Prins; Late Maastrichtian

  JOURNAL NAME: International Journal of Geosciences, Vol.4 No.6, August 14, 2013

  ABSTRACT: The upper Cretaceous interval of the Khoman Formation in the Tamera well, Siwa area, Western Desert of Egypt was studied for the first time on the basis of calcareous nannofossils. Twenty-one nannofossil species were identified from this interval. The study interval includes the Micula murus Zone, which is precisely dated as Late Maastrichtian age. The Micula murus Zone includes besides the marker species: Micula decussata, Watznaueria barnesae, Arkhangelsktella cymbiformis and relatively rare occurrences of Eiffellithus turrisieffellii, Cribrosphaerella ehrenbergii, Thoracosphaera operculata and Braarudosphaera bigelowii. The latest Maastrichtian Micula prinsi Zone is missing, and an unconformity surface is detected in this well. The high abundance of Micula decussata is indicative of very low surface productivity and high-stress environmental conditions. Several nannofossil species are recognized as cool water indicators such as Micula decussata, and Arkhangelsktella cymbiformis.