This caused coal to accumulate during the Permo-Carboniferous age. As the lowland swamps of the Permo-Carboniferous age shifted to drier, inland forests, the fungi were able to decompose wood ...

This time period took place 359 to 299 million years ago. 3 min read The Carboniferous period, part of the late Paleozoic era, takes its name from large underground coal deposits that date to it.