What significant event marked the end of the Paleozoic Era?

The end of the Paleozoic Era is characterized by the significant event of the final assembly of Pangea. This supercontinent brought together much of the Earth's landmass and significantly altered the planet's geography, climate, and ecological dynamics. The assembly of Pangea resulted in a variety of environmental changes, including the creation of vast inland seas and the adaptation of many species to new terrestrial and aquatic environments.

This geological event also set the stage for the major evolutionary transitions that would occur in the Mesozoic Era that follows, such as the diversification of reptiles and the eventual rise of dinosaurs. It is important to note that while the formation of Pangea was happening at the end of the Paleozoic, the beginning of the Mesozoic Era signifies the transition into a new chapter in Earth's geological history marked by distinct changes in flora and fauna. The assembly of Pangea is a significant geological milestone that played a crucial role in shaping future biological developments.