| Autor: |
PETER ADEGBENGA ADEONIPEKUN, MARGARET ADEBISI SOWUNMI |
| Jazyk: |
angličtina |
| Rok vydání: |
2019 |
| Předmět: |
|
| Zdroj: |
Acta Palaeobotanica, Vol 59, Iss 2, Pp 373-390 (2019) |
| Druh dokumentu: |
article |
| ISSN: |
2082-0259 |
| DOI: |
10.2478/acpa-2019-0011 |
| Popis: |
Attempts at reconstructing palaeoclimatic changes over time using palynomorphs of three oil wells drilled in the shallow offshore Niger Delta led to cluster analysis-aided recognition of seven pollen zones. These pollen zones are equivalent to ten palaeoclimatic zones with alternating dry and wet conditions. The palynomorphs were classified into phytoecological groups and changes in their relative abundances were employed to interpret the palaeoclimatic conditions of their source areas. Contrasting fluctuations in the proportions of the Spore (Pteridophytes) phytoecological group and those of the Poaceae were the main basis for palaeoclimatic inferences. Trends of the occurrence of other phytoecological groups were used to substantiate our palaeoclimatic inferences. In the latest Miocene (5.8–5.5 Ma), climatic conditions were mainly wet until between 5.5 and 5.0 Ma, when extreme dry conditions prevailed. The early Pliocene part (5.0–>3.4 Ma) was generally wet, while the late Pliocene part ( |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
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