Permian Time Period?

Question

What is the Earths surface look like then?

Answer 1

The Permian was characterized by an atmosphere that had 50% more oxygen than today. Plant life was luxurious, though dominated by gymnosperms. The large animal life was dominated by synapsids, mammal-like reptiles. It was a rich, complex ecosystem destroyed by the greatest mass extinction of all time, 251 million years ago.

Suggested reading on Permian fauna: Gorgon, the monsters that ruled the planet before the dinosaurs by Peter Ward
Suggested reading on the Permian extinction: When Life nearly Died by Michael Benton