Gondwanaland, the ancient southern supercontinent comprising present-day South America, Africa, India, Australia, and Antarctica, is most compellingly evidenced by the widespread occurrence of the Glossopteris flora, a distinctive Permian seed-fern group whose fossils are found across all these now-separated continents, indicating they were once joined and shared a common cool-temperate flora that could not have dispersed across the wide oceans separating them today.