On the origin of Nummulites: Urnummulites schaubi n. gen. n.sp., from the Late Paleocene of Egypt
Boukhary, professor Mohamed; Christian Scheibner;
Abstract
Urnummulites schaubi n. gen. n. sp., is a rotaliid foraminifera. It is found for the first time in the Late Paleocene toe of
slope sediments of a carbonate platform Stratigraphic section D6, Bir Dakhl, Southern Galala, Eastern Desert, Egypt. The form is believed
to be the ancestor of Nummulites. It is distinguished from Kathina by having asymmetrical polar pustules on both sides. The pustule
is onlywell pronounced ventrally,where it possesses perforations (punctuation) and is lacking theumbilical pillar found inKathina. In
the involute ventral side the test possesses “alar” prolongations. s. str., while these prolongations are lacking dorsally. The form also recalls
Laffitteina (a Maastrichtian genus) but it lacks the double septa and the ramifying interseptal canals. Urnummulites differs from all t
slope sediments of a carbonate platform Stratigraphic section D6, Bir Dakhl, Southern Galala, Eastern Desert, Egypt. The form is believed
to be the ancestor of Nummulites. It is distinguished from Kathina by having asymmetrical polar pustules on both sides. The pustule
is onlywell pronounced ventrally,where it possesses perforations (punctuation) and is lacking theumbilical pillar found inKathina. In
the involute ventral side the test possesses “alar” prolongations. s. str., while these prolongations are lacking dorsally. The form also recalls
Laffitteina (a Maastrichtian genus) but it lacks the double septa and the ramifying interseptal canals. Urnummulites differs from all t
Other data
| Title | On the origin of Nummulites: Urnummulites schaubi n. gen. n.sp., from the Late Paleocene of Egypt | Authors | Boukhary, professor Mohamed ; Christian Scheibner | Issue Date | 2009 | Journal | micropaleontology, vol. 55, no. 4, pp. 413-420, text-figures 1-3, plate 1, table 1, 2009 413 |
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