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.
1896 R. Wallace Farming Indust. of Cape Col. 55 [see Ecca].
1897 F. Macnab On Veldt & Farm 187It is a deposit from the crumbling hills of boulder and rock of the Dwyka [printed Duryka] conglomerate.
1905 A.W. Rogers in Flint & Gilchrist Science in S. Afr. 241The area occupied by the Karroo formation is sharply defined by the outcrops of the Dwyka series, of which the well-known glacial conglomerate is the most important member.
1905 A.W. Rogers in Flint & Gilchrist Science in S. Afr. 242A thick band of shale and sandstone (the Lower Dwyka shales) intervenes between the conglomerate and the uppermost member of the Cape system.
1920 F.C. Cornell Glamour of Prospecting 267We found the pits..sunk at the side of a dolerite dyke..bisecting the Dwyka shale of the pan, and from which it takes its name.
1965 Hamilton & Cooke Geology for S. Afr. Students 258Two divisions of the Dwyka Series are distinguishable, but only the Dwyka Tillite is really extensive.
1971 D.F. Kokot in Std Encycl. of Sn Afr. IV. 146Dwyka River, C.P...The name is derived form the Hottentot word ‘dwinka’, meaning salty...The river gives its name to the geological Dwyka Series, which extends over 800 miles of the south-central part of the sub-continent and forms the base of the Permo-Triassic Karoo System.
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