System Subsystem/
Stage Age (Ma)
Permian Cisuralian Asselian younger
Carboniferous Pennsylvanian Gzhelian 298.9 303.7
Kasimovian 303.7 307.0
Moscovian 307.0 315.2
Bashkirian 315.2 323.2
Mississippian Serpukhovian 323.2 330.9
Visean 330.9 346.7
Tournaisian 346.7 358.9
Devonian Late Famennian older
Subdivision of the Carboniferous system
according to the ICS, as of 2017.[1]

The Kasimovian is a geochronologic age or chronostratigraphic stage in the ICS geologic timescale. It is the third stage in the Pennsylvanian (late Carboniferous), lasting from 307 to 303.7 Ma.[2] The Kasimovian stage follows the Moscovian and is followed by the Gzhelian. The Kasimovian saw an extinction event which occurred around 305 mya, referred to as the Carboniferous Rainforest Collapse.[3]

Name and definitionEdit

The Kasimovian is named after the Russian city of Kasimov. The stage was split from the Moscovian in 1926 by Boris Dan'shin (1891-1941), who gave it the name Teguliferina horizon. The name was posthumously changed in Kasimov horizon by Dan'shin in 1947. The name Kasimovian was introduced by Georgy Teodorovich in 1949.

The base of the Kasimovian stage is at the base of the fusulinid biozone of Obsoletes obsoletes and Protriticites pseudomontiparus or with the first appearance of the ammonite genus Parashumardites. The top of the stage is close to the first appearances of the fusulinid genera Daixina, Jigulites and Rugosofusulina or the first appearance of the conodont Streptognathodus zethus. The golden spike for the Kasimovian stage had not yet been assigned as of 2008.


The Kasimovian is subdivided into three conodont biozones:

  • Idiognathodus toretzianus Zone
  • Idiognathodus sagittatus Zone
  • Streptognathodus excelsus and Streptognathodus makhlinae Zone

Kasimovian lifeEdit


Arthropods of the Kasimovian
Taxa Presence Location Description Images
Arthropleura Pennsylvanian Flénu Formation, Belgium
Farrington Formation, Scotland
Luisenthal Formation, Germany
northeastern North America
A 2 m (79 in) long millipede
Meganeura Pennsylvanian Commentry Shales Formation, France
England[citation needed]
A dragonfly with wingspans ranging from 65 cm (25.6 in) to over 70 cm (28 in)

Cartilaginous fishesEdit

Chondrichthyes of the Kasimovian
Taxa Presence Location Description Images
Janassa Carboniferous to Lopingian Bear Gulch Limestone, Nebraska & Minnelusa Formation, South Dakota, United States
Ichinotani Formation, Japan
a petalodontiform holocephalian



Temnospondyli of the Kasimovian
Taxa Presence Location Description Images
Actiobates Pennsylvanian Stanton Formation, Kansas, United States
Dendrerpeton Joggins & Parrsboro Formations, Nova Scotia, Canada


Reptiliomorpha of the Kasimovian
Taxa Presence Location Description Images
Desmatodon Red Knob Formation, Pennsylvania; Sangre de Cristo Formation, Colorado; Cutler Formation, New Mexico A diadectomorph
Solenodonsaurus Kladno Formation, Czech Republic


Eureptilia of the Kasimovian
Taxa Presence Location Description Images
Brouffia Nýřany site, Kladno Formation, Czech Republic
Coelostegus Nýřany site, Kladno Formation, Czech Republic


Synapsids of the Kasimovian
Taxa Presence Location Description Images
Archaeovenator Kasimovian-Gzhelian Calhoun Shale, Kansas, United States A varanopid
Datheosaurus Kasimovian-Asselian Ludwikowice Formation, Nowa Ruda, Poland A caseasaur
  • H. garnettensis
Garnett Quarry, Rock Lake Member, Anderson County, Stanton Formation, Lansing Group, Kansas, USA Currently assigned to Haptodus, this species may require its own genus
Ianthasaurus Pennsylvanian Stanton Formation, Kansas, United States An edaphosaurid
Ianthodon Pennsylvanian Stanton Formation, Kansas, United States A haptodontiform
Kenomagnathus Pennsylvanian Stanton Formation, Kansas, United States A haptodontiform
Ophiacodon Kasimovian-Kungurian Ada Formation, Oklahoma and possibly Joggins Formation, Nova Scotia, Canada An ophiacodontid


  1. ^ http://www.stratigraphy.org/index.php/ics-chart-timescale
  2. ^ Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.
  3. ^ Sahney, S., Benton, M.J. & Falcon-Lang, H.J. (2010). "Rainforest collapse triggered Pennsylvanian tetrapod diversification in Euramerica" (PDF). Geology. 38 (12): 1079–1082. doi:10.1130/G31182.1.CS1 maint: multiple names: authors list (link)


  • Dan'shin, V.M.; 1947: Geology and Mineral Resources of Moscow and its Surroundings, Izdat. Moskov. Obshch. Isp. Prir., Moscow, 308 pp. (in Russian).
  • Menning, M.; Alekseev, A.S.; Chuvashov, B.I.; Davydov, V.I.; Devuyst, F.-X.; Forke, H.C.; Grunt, T.A.; Hance, L.; Heckel, P.H.; Izokh, N.G.; Jin, Y.-G.; Jones, P.J.; Kotlyar, G.V.; Kozur, H.W.; Nemyrovska, T.I.; Schneider, J.W.; Wang, X.-D.; Weddige, K.; Weyer, D. & Work, D.M.; 2006: Global time scale and regional stratigraphic reference scales of Central and West Europe, East Europe, Tethys, South China, and North America as used in the Devonian–Carboniferous–Permian Correlation Chart 2003 (DCP 2003), Palaeogeography, Palaeoclimatology, Palaeoecology 240(1-2): pp 318–372.
  • Teodorovich, Georgy I. (1949). О подразделении верхнего карбона на ярусы [On the subdivision of the Upper Carboniferous into stages]. Doklady Akademii Nauk SSSR (in Russian). 67 (3): 537–540.

External linksEdit