Dinantian

The Dinantian is a geologic subsystem of the Carboniferous period, spanning from approximately 358.9 to 326.3 million years ago. It is older (lower) than the Silesian subsystem. Regionally, the Dinantian is sometimes referred to as the Lower Carboniferous.

The name "Dinantian" is derived from Dinant, a town in Belgium where rocks of this age are well-exposed.

The Dinantian is further subdivided into stages, which may vary slightly depending on the regional classification used. Commonly recognized stages include the Tournaisian and Visean.

Rocks formed during the Dinantian are characterized by extensive carbonate deposition, leading to the formation of thick limestone sequences. These limestones are often rich in fossils, providing valuable insights into the marine life of the time, including foraminifera, corals, brachiopods, and crinoids. The Dinantian also saw the early diversification of terrestrial plants.

The Dinantian period experienced significant changes in sea level and climate, impacting the distribution of sedimentary environments and the evolution of life. Tectonic activity also played a role in shaping the landscape during this time.

The Dinantian is significant for its economic resources, including limestone used in construction and industry, as well as potential reservoirs for hydrocarbons.