323 Million B.C.T. - The Mississippian Subperiod Ended

Around 323 Million B.C.T., the Mississippian subperiod came to an end.

The Mississippian is a subperiod in the geologic timescale or a subsystem of the geologic record. It is the earliest/lowermost of two subperiods of the Carboniferous period lasting from roughly 358.9 ± 0.4 to 323.2 ± 0.4 million years ago. As with most other geochronologic units, the rock beds that define the Mississippian are well identified, but the exact start and end dates are uncertain by a few million years. The Mississippian is so named because rocks with this age are exposed in the Mississippi River valley.

The Mississipian was a period of marine ingression in the Northern Hemisphere.  The ocean stood so high only the Fennoscandian Shield (Scandinavia) and the Laurentian Shield (Saint Lawrence and Great Lakes region) stood above sea level. The cratons (the geologic shields) were surrounded by extensive delta systems and lagoons, and carbonate sedimentation on the surrounding continental platforms, covered by shallow seas.

In North America, where the interval consists primarily of marine limestones, the Mississippian subperiod was in the past treated as a full-fledged geologic period between the Devonian and the Pennsylvanian. During the Mississippian subperiod an important phase of orogeny (mountain formation) occurred in the Appalachian Mountains.

In Europe, the Mississippian and Pennsylvanian are one more-or-less continuous sequence of lowland continental deposits and are grouped together as the Carboniferous system, and sometimes called the Upper Carboniferous and Lower Carboniferous instead.