Conchostracans have been described from fresh-water lake sediments interbedded in the Jurassic Kirkpatrick basalts which crop out on a ridge trending northeast of Blizzard Heights, Queen Alexandra range, Antarctica. Comparison of this fauna with conchostracans from Victoria Land reveals similarities which make it possible to trace this fresh-water zone from Brimstone peak to Blizzard Heights (600 miles). Descendants of a leaiid conchostracan species which became extinct at the end of the Permian persisted through the Jurassic or migrated to Australia or South Africa during the Triassic. The apparent correlations between the Jurassic conchostracan zones of east Africa and India suggest similar correlations with other Gondwana continents.

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