Densubon Fm

having an outcrop exposure which occupies the central and western parts of the Obosum Syncline. Lower part of Obosum Gr.

Synonym: Densubon Sandstone Fm

References: Carney et al., 2010

[Fig. 1. Geological map of the Volta Basin and surroundings, after Sougy (1970) and Affaton et al. (1980).]

[Fig. 2. Schematic lithostratigraphic sections showing principal lithologies and inferred correlations between Kwahu and Bombouaka group units across the Volta Basin.]

[Table 1. Published stratigraphic data available for Voltaian deposits]

[Table 2. Proposed lithostratigraphic scheme (left-hand column) compared with previous nomenclature.]

[Fig. 3. Synthetic lithologic section of the Volta Basin sedimentary infilling]

It consists of pink to grey feldspathic arenites predominate, intercalated with subordinate beds of variegated, red or green mudstone and siltstone. The sandstones show fine-scale trough cross-lamination and contain red or green mudflakes. About 5.7km south of Densubon, pink, medium- to fine-grained, highly micaceous arkosic sandstones with local trough cross-lamination are present in roadside exposures. To the west, exposures along the Ejura-Atebubu road show pink, fine-grained, micaceous and feldspathic quartz-arenites with trough cross-lamination and maroon mudflakes. Although compositional maturity is relatively high in these sandstones, beds of more immature dark red, micaceous, fine- to medium-grained feldspathic and lithic arenites are also present (Carney et al., 2010).

mid-latest Ediacaran

The associated sedimentary structures suggest deposition by flash floods and braided streams in wadi, alluvial fan and floodplain environments (Carney et al., 2010). Paleocurrent directions in both the Dunkro and Densubon formations are mainly to the WSW.