The fossil that occurs on the most land masses is Glossopteris, a type of seed fern. Its fossils have been found on the continents of South America, Africa, India, Australia, and Antarctica. This widespread distribution strongly suggests that these continents were once joined together, forming the supercontinent Pangaea, before they broke apart and drifted to their current locations.

The existence of Glossopteris fossils on these now-separated continents provides powerful evidence for continental drift and the theory of plate tectonics. It supports the idea that the Earth's continents were once connected and have moved over millions of years, carrying these fossils with them.

The specific timing of Pangaea's breakup is still under debate, but the presence of Glossopteris fossils suggests that it occurred relatively recently, in geological terms, during the Permian and Triassic periods, roughly 250-200 million years ago.