A geologic (sub)Period lasting from roughly 345 million years before the present to 325 million years before the present. In North America where the interval is primarily marine limestones, it is treated as a full fledged Geologic Period between the
Devonian and the
Pennsylvanian. In Europe, the Mississippian and
Pennsylvanian are one more or less continuous sequence of lowland continental deposits and are lumped together as the
Carboniferous Period. Refer to the
Carboniferous Period for more information.