Petrographic, stratigraphic, and structural evidence is presentc(l for the sediment:try origin of one of the oldest known stratiform barite del)osits. The setting' {)f the t)aritcs within the Fig Tree Group of the Swaziland Sut)ergroul• (>3.2 1,.v.) is {rotlined in terms of a new facies concept. The barite was deposited o• a narr{•w sulm•:tri•e ridge zone. This "Proto-Inyoka Zone" separated a "graywackc f;tcics" fr•)m :t "•halh)w-,:,tcr facies" within the Fig Trec basin.
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