Mississippian

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 and the Laurentian Shield stood above sea level. The cratons 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, it 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 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.

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Other articles related to "mississippian":

Mississippian (disambiguation)
... The Mississippian was an epoch of the Carboniferous Period lasting from roughly 360 to 325 million years ago ... Mississippian may also refer to Mississippian culture, a culture of Native American mound-builders from 900 to 1500 AD Mississippian Railway, a short line railroad A native of Mississippi ...
List Of Archaeological Sites In Tennessee - Campbell County
... Cultural affiliation(s) Year(s) excavated Status Bowman Farm Site 40CP2 Mississippian 1930s Harris Farm Site 40CP9 Mississippian 1930s Heatherly Stone Mounds 40CP1 Woodland 1930s Irvin Village 40CP5 ...
Mississippian - Subdivisions
... In the official geologic timescale, the Mississippian is subdivided into three stages Serpukhovian (330.9 ± 0.2 to 323.2 ± 0.4 mya) Visean (346.7 ± 0.4 to 330.9 ± 0.2 mya) Tournaisian (358.9 ± 0.4 to 346 ... In the North American system, the Mississippian is subdivided into four stages Kinderhookian (the lower two-thirds of the Tournaisian) Osagean (top of the Tournaisian and ...
List Of Archaeological Sites In Tennessee - Hamilton County
... Cultural affiliation(s) Year(s) excavated Status Audubon Acres 40HA84 Mississippian Citico 40HA65 Mississippian 1970s Dallas Island 40HA1 Woodland ...
Mississippian Culture - Known Mississippian Chiefdoms
... Although the Mississippian culture was heavily disrupted before a complete understanding of the political landscape was written down, many Mississippian political bodies were ...