Leaiid Conchostracan Zone in Antarctica and Its Gondwana Equivalents

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Science  01 Nov 1963:
Vol. 142, Issue 3592, pp. 591-592
DOI: 10.1126/science.142.3592.591


Two species of conchostracans (class Crustacea) occur in the coal measures of the Ohio Range, associated with a typical Glossopteris flora. New Leaia and Cyzicus (Lioestheria) species occur in a restricted zone near the top of the stratigraphic section. The biofacies represents a swampy environment and deposition in short-lived ponds of still water under variable weather cycles. The zone compares closely with the leaiid zones in South Africa, South America, and Australia, and is assigned to the Middle-Upper Permian, specifically, Lower Beaufort age.