Geology and geomorphology of southern Benin

Jun 30th, 2015
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1 Aims of the research : Physiography is the first criterion to be used for the characterisation within the SOTER approach (SOil and TERrain, FAO,1993). The separation is based on the dominant gradient of the slopes and the relief intensity. In combination with hypometric (absolute elevation above sea-level) grouping, and a factor characterising the degree

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Geology and geomorphology of southern Benin Attanda Mouinou Igu and Ulrich Weller email: weller@janus.gsf.deKeywords: Geomorphology, Geology, SOTER Benin 1 Aims of the research Physiography is the first criterion to be used for the characterisation within the SOTER approach (SOil and TERrain, FAO,1993). The separation is based on the dominant gradient of the slopes and the relief intensity. In combination with hypometric (absolute elevation above sea-level) grouping, and a factor characterising the degree of dissection, a broad subdivision of an area can be made and delineated on the map, referred to as first and second level major landform. The major landform can be subdivided according to lithology or geology. In southern and central Benin in particular a combination of landform and lithology characterises the terrain units. The aim of this study is to present the physiography and geology of a recent SOTER study area in Benin which covers the surface between 9 latitude and thw Atlantic ocean. The total area is about 37.000 km. It includes the departments of Oum, Mono, Plateau, Atlantic, Couffo, and Zou. 2 Approach The base of the presented map are topography (1:50.000, IGN, 1954, 1963) and geology maps (1:200. 000 OBEMINES, 1989), which were digitised using Arc-Info software. 3 Results and Interpretation 3.1 Geomorphology The south of Benin is formed by the so-called coastal sedimentary basin. It extends from Togo to Nigeria. To the south

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