Yes. The Mississippian period is a part of the Paleozoic era, along with the Cambrian, Ordovician, Silurian, Devonian, Pennsylvanian, and Permian periods.
The Paleozoic is split into 6 time periods spanning approximately 240 million years (from 542 to 251 million years ago). These include the following: 542 Ma Cambrian 488 Ma Ordovician 443 Ma Silurian...