| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 6443768 | Journal of African Earth Sciences | 2014 | 21 Pages |
Abstract
As a result of the occurrence of the nannofossil marker species; Isthmolithus recurvus only in side views below and above the first appearance of Chiasmolithus oamaruensis at both Naalun and Guta section-I, this species is not reliable to define the NP18/NP19 zonal boundary. At Guta section-II, the Middle/Upper Eocene boundary can be delineated by the first appearance of Globigerinatheka semiinvoluta above the first occurrence of Isthmolithus recurvus in both plane and side views.
Related Topics
Physical Sciences and Engineering
Earth and Planetary Sciences
Geology
Authors
Akmal Mohamed Marzouk, Ahmed Moustafa El Shishtawy, Atef Masoud Kasem,