Question: what is a description of the paleozoic era

title: Paleozoic
text: The Permian spanned from 299 to 252 million years ago and was the last period of the Paleozoic Era . At the beginning of this period , all continents joined together to form the supercontinent Pangaea , which was encircled by one ocean called Panthalassa . The land mass was very dry during this time , with harsh seasons , as the climate of the interior of Pangaea was not regulated by large bodies of water . Diapsids and synapsids flourished in the new dry climate . Creatures such as Dimetrodon and Edaphosaurus ruled the new continent . The first conifers evolved , and dominated the terrestrial landscape . Near the end of the Permian , however , Pangaea grew drier . The interior was desert , and new species such as Scutosaurus and Gorgonopsids filled it . Eventually they disappeared , along with 95 % of all life on Earth , in a cataclysm known as `` The Great Dying '' , the third and most severe mass extinction .