Calcareous nannofossil biostratigraphy of the Paleogene sediments on an onshore–offshore transect of Northern Sinai, Egypt
✍ Scribed by Akmal M Marzouk; Soheir I.M Soliman
- Book ID
- 104019799
- Publisher
- Elsevier Science
- Year
- 2004
- Tongue
- English
- Weight
- 915 KB
- Volume
- 38
- Category
- Article
- ISSN
- 1464-343X
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✦ Synopsis
Calcareous nannofossils were studied in the Paleogene sediments (Upper Paleocene-Lower Oligocene) in four wells onshore and offshore of Northern Sinai, Egypt. The sediments provided well preserved and diversified nannofossils. The nannofossil biostratigraphy records numerous hiatuses of different stratigraphic units in the sections. Hiatuses of considerable duration were recorded across the Paleocene-Eocene boundary, across the Lower-Middle Eocene boundary, and in the Middle-Upper Eocene/Lower Oligocene. The Upper Eocene sediments were not found in the offshore wells, but a shaly-marly succession with intercalations of limestone was deposited in the onshore wells. The partial absence of the Upper Eocene may be related to tectono-sedimentary processes (uplift and/or erosion). At the same time the onshore area seems to have been subjected to vertical movements with less intensity, because of the presence of Zone NP18.
The paleoenvironmental settings of the sediments are discussed, based on the nannofossil assemblages.