Ganigobis Formation

Description

The Ganigobis Formation is an extensive unit with a maximum thickness of 240 metres (790 ft) evidenced in the Vreda borehole. The conglomerates, sandstones, shales and tuff of the formation were deposited in a glacio-lacustrine to marine environment. The Ganigobis Formation provides fossil fish as well as bivalves (e.g. Nuculopsis), gastropods (e.g. Peruvispira), scyphozoa (e.g. Conularia), crinoid stalks, foraminifera (Hyperammina, Ammodiscus, Glomospira, Ammobacculites and Spiroplectammina), sponges and sponge spicules, radiolaria, coprolites and permineralised wood.

Zircons of the Ganigobis Shale Member yield SHRIMP-ages of 302-300 Ma. This dates the uppermost part of the second deglaciation sequence in southern Namibia to the Late Carboniferous (Gzelian) and provides a minimum age for the onset of Karoo-equivalent marine deposition. The age of the uppermost argillaceous part of the third deglaciation sequence (297 Ma) was determined from zircons of a tuffaceous bed sampled in a roadcut in the Western Cape Province, South Africa.