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Dwyka, noun

Origin:
KhoikhoiShow more The name of a river in the Cape, from a Khoikhoi word meaning ‘salty’, ‘brackish’ (see Kokot quotation 1991).
Geology
Usually attributive, designating one of the geological groups which make up the lower beds of the Karoo System, or (in the phrases Dwyka conglomerate, Dwyka shale, Dwyka tillite, etc.) any of the types of rock found in this group. See also Ecca, Karoo System (Karoo sense 3).
1896 R. Wallace Farming Indust. of Cape Col. 55In superposition to this is the Dwyka or trap conglomerate, a unique formation which has puzzled geologists.
1971 T. Stratten in Std Encycl. of Sn Afr. IV. 146Dwyka Series, This geological series forms the lowermost subdivision of the Karoo System. It is subdivided into Dwyka tillite at the base, which is overlain, in the southern and western parts of the Karoo Basin, by the Upper Dwyka shales, which are in turn overlain by a conspicuous zone of black carbonaceous shales. These weather white on exposure and are accordingly known as the White Band.
designating one of the geological groups which make up the lower beds of the Karoo System, or (in the phrasesDwyka conglomerate, Dwyka shale, Dwyka tillite, etc.) any of the types of rock found in this group.

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18961971