Madygen Formation

From Wikipedia, the free encyclopedia
Jump to: navigation, search
Madygen Formation
Stratigraphic range: Middle - Upper Triassic, Ladinian–Carnian
Type Geological formation
Thickness 600 m
Primary Conglomerate, sandstone, mudstone
Region Turkestan Range, Batken Province
Country  Kyrgyzstan
Type section
Named for Madygen village
Named by Evgeny A. Kochnev

The Madygen Formation is a Triassic-age geologic formation in Kyrgyzstan. It consists of terrestrial lacustrine (lake) and fluvial (river) deposits. Many vertebrate fossils have been found from the formation, including those of cartilaginous fishes and unusual Triassic reptiles like Sharovipteryx and Longisquama.[1][2]


Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Cartilaginous fishes[edit]

Taxon Member Material Notes Images

Fayolia sharovi[1]

An egg capsule likely belonging to a xenacanthid.

Lonchidion ferganensis[1]

Teeth and egg capsules.

A hybodontid shark.

Palaeoxyris alterna[1]

Teeth and egg capsules.

A hybodontid shark.


Taxon Member Material Notes Images

Madygenerpeton pustulatus

A chroniosuchid reptiliomorph.

Triassurus sixtelae

A possible early caudate (salamander) known from fossil larvae.


Taxon Member Material Notes Images

Kyrgyzsaurus bukhanchenkoi[3]

A single specimen preserving the front half of a skeleton and scale impressions.

A drepanosaur.

Longisquama insignis

A reptile with an elongated row of scales along its back.

Sharovipteryx mirabilis

A gliding prolacertiform.

Sharovipteryx mirabilis jconway.png


Taxon Member Material Notes Images

Madysaurus sharovi

A cynodont.


  1. ^ a b c d Fischer, J.; Voigt, S.; Schneider, J.W.; Buchwitz, M.; Voigt, S. (2011). "A selachian freshwater fauna from the Triassic of Kyrgyzstan and its implication for Mesozoic shark nurseries". Journal of Vertebrate Paleontology. 31 (5): 937–953. doi:10.1080/02724634.2011.601729. 
  2. ^ Unwin, D.M.; Alifanov, V.R.; Benton, M.J. (2003). "Enigmatic small reptiles from the Middle-Late Triassic of Kyrgyzstan". In Benton, M.J.; Shishkin, M.A.; and Unwin, D.M. The Age of Dinosaurs in Russia and Mongolia. Cambridge: Cambridge University Press. pp. 177–186. ISBN 9780521545822. 
  3. ^ V. R. Alifanov and E. N. Kurochkin (2011). "Kyrgyzsaurus bukhanchenkoi gen. et sp. nov., a new reptile from the triassic of southwestern Kyrgyzstan". Paleontological Journal. 45 (6): 639–647. doi:10.1134/S0031030111060025.