Permo-Carboniferous rocks are in places not differentiated because of the presence of transitional fossils, and also where no conspicuous stratigraphic break is present.
The widespread distribution of Permo-Carboniferous glacial sediments in South America, Africa, Madagascar, Arabia, India, Antarctica and Australia was one of the major pieces of evidence for the theory of continental drift, and led ultimately to the concept of a super-continent, Pangaea.
[1] Toward the end of the Carboniferous, around 290 million years ago, Gondwana, the southern part of Pangaea, was located near the south pole.
[2] Chronological difficulties complicate the task of charting the evolution of the ice sheet over this interval.
[3] The Permo-Carboniferous ice sheet was so extensive that it would occupy a circle spanning 50 degrees of latitude centered on the pole.