Formation and Collapse of the Kalahari Duricrust [‘African Surface’] Across the Congo Basin, with Implications for Changes in Rates of Cenozoic Off-Shore Sedimentation - Geology and Resource Potential of the Congo Basin - page 196

c b a

WEST EAST

Kalahari Plateau

1000

Hardpan

900

A

800

Wamba River

B

700

600

Kwango River

C

Kwango Group

500

Precambrian Basement

400

Fig. 10.9 Simplified E-W cross-section across the Kwango Valley in southwestern DRC. ( a ) Large blocks of silcrete and calcrete ( ' Polymorph Sandstones ' ) fragmented from the upper part of
the adjacent KP, ( b ) preserved on slopes, and ( c ) re-deposited within the Kwango river terraces