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Abstract Detail



Paleobotanical Section

Kayefor Ebigwai , Dr Joseph [1].

Palynological evidence of Paleogene-Neogene (Tertiary) biozonal- age variations in some sections of the Mfamosing member of the Asu River Group.

AbstractThe Asu River Group, a member of the Lower Benue Trough is one of the most prolific limestone producing areas of Africa. Despite this fact, very little information have been published on it palyno flora. Forty-five and thirty nine ditch cuttings from two wells ranging in depth of 1750ft to 3150ft were donated by UNICEM Nigeria . Sixty five palynomorphs were recovered, out of which 43 were pollen grains, 11 were spores and 11 others were dinocyst, acritachs, and algal or charred poaceae cuticles. The strata penetrated by the wells are dated paleogene – early neogene based on the occurrence of Retistephanocolpites spp., Magnastriatites howardi, Foveotricolporites crassiexinus, Psilatricolporites benueensis and Cissus quadrangularis. The paleogene-neogene boundary was put at 2320ft and 2518ft of well 1 and well 2 respectively based on the first appearance of Psilatricolporites molnae and subsequent regular occurrences of Retimonicolpites pluribaculatus and trichotomosulcites. Two depositional environments continental and transitional were deduced based on the relative abundance and diversity of the miospores and marine palynomorphs. The four determined biozones (A, B, C and D) were based on the miospores distribution and abundance especially those of Monoporites annulatus and Zonocostites ramonae. Thus this study has significantly contributed to the scanty data base of the palynoflora records of Mfamosing and equally established palynofacies records of the paleogene- neogene age for this Asu River member group. This will aid further studies in biostratigraphy and correlation of strata within the Lower Benue Trough.


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1 - University of Calabar, Department of Botany, pmb 1115, Calabar, +234

Keywords:
mafamosing
Calabar
paleogene.

Presentation Type: Oral Paper:Papers for Sections
Session: 8
Location: Whitewater/Grove
Date: Monday, July 28th, 2014
Time: 2:15 PM
Number: 8018
Abstract ID:53
Candidate for Awards:Isabel Cookson Award


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