Mississippian

related topics
{island, water, area}
{land, century, early}
{math, number, function}

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 359 to 318 Ma (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.

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. 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. During the Mississippian subperiod an important phase of orogeny occurred in the Appalachian Mountains.

Subdivisions

In the official geologic timescale, the Mississippian is subdivided into three stages:

The first two come from European stratigraphy, the last is from Russian stratigraphy. Besides Europe and Russia, there are many local subdivisions that are used as alternatives for the international timescale. In the North American system, the Mississippian is subdivided into four stages:

Full article ▸

related documents
Oceanus Procellarum
Guadalquivir
Soay, Skye
South Island National Park
Geography of Anguilla
Errinundra National Park
Endeavour River National Park
Geography of Andorra
Rapid Update Cycle
10th millennium BC
Geography of Tanzania
Bering Island
Cocoparra National Park
Sénégal River
Alfred National Park
Lihou
Geography of Liechtenstein
Halvergate Marshes
Girraween National Park
Bridalveil Fall (Yosemite)
Leeuwin-Naturaliste National Park
Lac de Guiers
Tarra-Bulga National Park
Anadyr River
Naxos Island
Little Cumbrae
Geography of Slovenia
Horse latitudes
Wadden Sea
Alaska Interior