Continental Terminal Gr
Period:
Paleogene
Age Interval:
Eocene
Province:
Sokoto Basin (S. Iullemmeden Basin)
Type Locality and Naming
See Gwandu Fm
[Fig. 1. Stratigraphic successions in the Nigerian sector of the lullummeden Basin (Sokoto Basin)]
Lithology and Thickness
Gwandu Fm consists of continental lacustrine sediments and the youngest Paleogene formation in the Sokoto section of the Iullemmeden Basin. It has massive white clay interbedded with coarse-grained red sandstone and mudstone with lignite or peat bands (Whiteman, 1982). The maximum thickness was estimated to be about 1000ft near the Niger-Nigeria frontier (Kogbe, 1976).
Lithology Pattern:
Sandy claystone
Relationships and Distribution
Upper contact
Overlain by the Kalahari Sands?????? Check. NO – See Geology and Resources of Nigeria book section on the Neogene deposits
Regional extent
Iullemmeden Basin (22,000km2 area – Nwajide, 2013)
GeoJSON
null
Fossils
Palynomorphs, Plant fossils, mollusks
Age
Eocene
Age Span:
Beginning stage:
Ypresian
Fraction up in beginning stage:
0.0
Beginning date (Ma):
56.00
Ending stage:
Priabonian
Fraction up in the ending stage:
1.0
Ending date (Ma):
33.90
Depositional setting
Continental and lacustrine (Whiteman, 1982)
Depositional pattern:
Additional Information
Compiler:
Enam O. Obiosio, Solomon Joshua Avong and Henry Nasir Suleiman (2024)- Stratigraphic Lexicon compiled from the following books:Nigeria: Its Petroleum Geology, Resources and Potential, by Arthur Whiteman, 1982; (Volume 1) Published by Graham and Trotman Ltd.A review of the Cretaceous System in Nigeria by P. M. Zaborski (1998) In Africa Geoscience Review, Vol.5, No.4, pp385-483
Geology and Mineral Resources of Nigeria by Nuhu George Obaje, Published by Springer-Verlag Berlin Heidelberg 2009; http://www.springer.com/series/772
Geology of Nigeria Sedimentary Basins, Nwajide C. S., 2013; Published by CSS Bookshops Limited, Lagos Nigeria.