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Profound short-lived events about the Permian/Triassic (P/Tr) boundary, determined here as 250 Ma, include (1) magmatic events: rapid eruption of the vast flood basalt of the Siberian Traps and the peak of convergent magmatism in the Gondwanaland province along the Panthalassan margin, represented in Australia by the Dundee/Emmaville Volcanics and in South America by the Choiyoi province; (2) paleoclimatic change: following the last ice-rafting dropstone in eastern Australia, an abrupt change from coal measures to redbeds in the Gondwanaland province; (3) biota extinctions: indicated by a minimum standing diversity of marine invertebrates and by the replacement of the Glossopteris flora...

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