Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous Period , though some pteridosperm-like plants seem to have survived into Eocene times , fossilized in Tasmania .
Pteridosperms declined during the Mesozoic Era and had mostly disappeared by the end of the Cretaceous , though some fossil pteridosperm-like plants seem to have survived into Eocene times in Tasmania .