Research topic: Carboniferous period

Carboniferous period , fifth period of the Paleozoic era of geologic time (see Geologic Timescale , table), from 350 to 290 million years ago. Historical Geology of the Period The Carboniferous period was marked by vast, coal-forming swamps (see also bog ) and a succession of changes in the earth's surface that, continuing into the Permian period , ended the Paleozoic era. The Carboniferous is often split into two divisions, the Mississippian and the Pennsylvanian; in the United States the break in the geologic sequence is so sharp that each division is commonly considered an... Read more