Madygen Formation

Madygen Formation Stratigraphic range: Middle - Upper Triassic, Ladinian–Carnian PreЄ Є O S D C P T J K Pg N
Type	Geological formation
Thickness	600 m
Lithology
Primary	Conglomerate, sandstone, mudstone
Location
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]

Paleobiota

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

Cartilaginous fishes

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.

Amphibians

Taxon	Member	Material	Notes	Images
Madygenerpeton pustulatus			A chroniosuchid reptiliomorph.
Triassurus sixtelae			A possible early caudate (salamander) known from fossil larvae.

Reptiles

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.

Synapsids

Taxon	Member	Material	Notes	Images
Madysaurus sharovi			A cynodont.

References

1. 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.