pangaea was one landmass that was made up of all of the land on earth today.
Alfred Wegener.Alfred Wegener was a German scientist and proposed Pangaeaa million/billion years ago, all of the land formed together and was called Pangaea
The worst catastrophe that occurred during the Jurassic period was at the start, the Triassic-Jurassic Extinct Event, where changing climates caused the extinction of all crusotarsan archosaurs other than crocodilians, and the extinction of most remaining theraspids and many giant amphibians. It is possible that the climate change was due to changes in carbon dioxide levels caused by volcanic eruptions.