Britannica Sources used in this answer

Which rocks are most typical of the Mississippian Subperiod in the Northern Hemisphere?

Created from Britannica articles using AI. AI can make mistakes, so verify using Britannica articles.

Carboniferous paleogeography — Carboniferous Period Distribution of landmasses, mountainous regions, shallow seas, and deep ocean basins during the late Carboniferous Period. Included in the paleogeographic reconstruction are the locations of the interval's subduction zones.

The Mississippian Subperiod is most characteristically defined by widespread shallow-water limestone deposits that occupied the interiors of continents, particularly across the Northern Hemisphere.12

These carbonate deposits include several distinct types:
* Crinoidal limestones: Composed of the disarticulated remains of crinoids, these are common in North America and often exhibit cross-bedding and ripple marks.3
* Oolitic limestones: Formed in high-energy, shallow-water marine environments, these consist of ooliths precipitated around a nucleus.3
* Lime mudstones: These reflect quieter, shallow-water environments.3

Additionally, these limestones are frequently associated with lenses and beds of chert. In deeper intracontinental basins and ocean troughs, the Mississippian is instead characterized by terrigenous clastics, such as sandstone and shale, deposited as turbidites. While terrigenous clastic facies were generally less developed during this subperiod compared to later times, they became more prominent in the upper portion of the Mississippian as marine cycles developed.32