This creature likely was left behind after the waters "abated".
"You might call it the "swamp thing." .... a large creature builtsomewhat like a salamander but with frightful fangs prowled the swamps and lakes of what is now Namibia, ambushing prey as a top predator in a chilly ecosystem long before the dinosaurs.
The creature, named Gaiasia jennyae, lived during the Permian Period and measured at least 8 feet long - and perhaps up to 13 feet, according to researchers who announced the discovery of its fossilized remains.
Its large, round, flat skull measured more than 2 feet long, and it had interlocking fangs at the front of its mouth. The fossils were unearthed in Namibia, a country in southwest Africa.
Because of the gradual movement over time of the crustal plates that form Earth's outer layer - a process called plate tectonics - this place was even further south when Gaiasia lived, almost even with Antarctica's current northernmost point."
MS