Kasimovian
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Kasimovian
Kasimovian
307.0 ± 0.1 - 303.7 ± 0.1 Ma
Chronology
Etymology
Name formalityFormal
Usage information
Celestial bodyEarth
Regional usageGlobal (ICS)
Time scale(s) usedICS Time Scale
Definition
Chronological unitAge
Stratigraphic unitStage
Time span formalityFormal
Lower boundary definitionNot formally defined
Lower boundary definition candidatesFAD of the Fusulinid Protriticites or 1 million years older Montiparus montiparus[2]
Lower boundary GSSP candidate section(s)
Upper boundary definitionNot formally defined
Upper boundary definition candidatesFAD of the Conodont Idiognathodus simulator[2]
Upper boundary GSSP candidate section(s)
  • Southern Ural mountains[2]
  • Nashui, Luodian County, Guizhou, China

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.[3] 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.[4] It roughly corresponds to the Missourian in North American geochronology and the Stephanian in western European geochronology.

Name and definition

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.

Biozones

The Kasimovian is subdivided into three conodont biozones:

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

Kasimovian life

Arthropods

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
Arthropleura NT small.jpg
Meganeura Pennsylvanian Commentry Shales Formation, France
England[]
A dragonfly with wingspans ranging from 65 cm (25.6 in) to over 70 cm (28 in)
WLA hmns Prehistoric Dragonfly.jpg

Cartilaginous fishes

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
Janassa bituminosa.jpg

Xenacanthus

Carboniferous to Cisuralian Czech Republic, France A xenacanthidan elasmobranch
Xenacanthus NT small.jpg

Ray-finned fishes

Actinopterygii of the Kasimovian
Taxa Presence Location Description Images
Tanyrhinichthys Carboniferous (Missourian) Tinajas Member of the Atrasado Formation, Kinney Brick Quarry, New Mexico an early actinopterygian with a long rostrum, which it evolved in convergence to extant sturgeons

Amphibians

+Temnospondyls

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

Reptiliomorphs

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
Solenodonsaurus1DB.jpg

Eureptiles

Eureptilia of the Kasimovian
Taxa Presence Location Description Images
Brouffia Ný?any site, Kladno Formation, Czech Republic One of the most basal eureptiles.
Coelostegus Ný?any site, Kladno Formation, Czech Republic Possibly the basalmost known eureptile.

Synapsids

Synapsids of the Kasimovian
Taxa Presence Location Description Images
Archaeovenator Kasimovian-Gzhelian Calhoun Shale, Kansas, United States A basal varanopid
ArchaeovenatorDB.jpg
Datheosaurus Kasimovian-Asselian Ludwikowice Formation, Nowa Ruda, Poland A caseasaur
Datheosaurus18DB.jpg
"Haptodus" garnettensis late Kasimovian Garnett Quarry, Rock Lake Member, Anderson County, Stanton Formation, Lansing Group, Kansas, USA A basal haptodontiform currently assigned to Haptodus, this species may require its own genus
Haptodus garnettensis.jpg
Ianthasaurus Pennsylvanian Stanton Formation, Kansas, United States A basal edaphosaurid
Ianthasaurus223DB.jpg
Ianthodon Pennsylvanian Stanton Formation, Kansas, United States A basal haptodontiform
Kenomagnathus Pennsylvanian Stanton Formation, Kansas, United States A haptodontiform
Kenomagnathus DB.jpg
Ophiacodon Kasimovian-Kungurian Ada Formation, Oklahoma and possibly Joggins Formation, Nova Scotia, Canada An ophiacodontid
Ophiacodon NT small.jpg

References

  1. ^ "Chart/Time Scale". www.stratigraphy.org. International Commission on Stratigraphy.
  2. ^ a b c d "Global Boundary Stratotype Section and Point". International Commission of Stratigraphy. Retrieved 2020.
  3. ^ Gradstein, F.M.; Ogg, J.G. & Smith, A.G.; 2004: A Geologic Time Scale 2004, Cambridge University Press.
  4. ^ 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)

Literature

  • 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). ? ? ? [On the subdivision of the Upper Carboniferous into stages]. Doklady Akademii Nauk SSSR (in Russian). 67 (3): 537-540.

External links


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Kasimovian
 



 



 
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