Qingtoushan Formation
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| Qingtoushan Formation | |
|---|---|
| Stratigraphic range: Middle Permian, | |
| Type | Geological formation |
| Underlies | Sunan Formation |
| Overlies | Yaogou Formation |
| Thickness | Over 300 metres |
| Lithology | |
| Primary | Sandstone |
| Other | Mudstone |
| Location | |
| Region | Gansu |
| Country | China |
| Extent | Qilian Mountains |
| Type section | |
| Named by | Liu et al |
| Year defined | 2012 |
The Qingtoushan Formation is a Middle Permian-age geologic formation in the Qilian Mountains of Gansu, China. It is known for its diverse tetrapod fauna known as the Dashankou fauna, which likely dates to the Roadian, and includes some of the oldest known therapsids.[1] This formation was previously erroneously named as the Xidagou Formation, a name which applies to otherwise Triassic strata in the northern Qillian Mountains. The formation is over 300 metres thick, and primarily consists of purple-red coarse sandstones, with minor purple mudstone.[2]
Paleobiota
[edit | edit source]Color key
|
Notes Uncertain or tentative taxa are in small text; |
Synapsida
[edit | edit source]| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
|
B. qilianicus[3] |
A well-preserved skull[3] | An anomodont[3] | ||||
|
S. yumenensis[4] |
A single skull (GMV 1601) | An anteosaurid dinocephalian | ||||
|
S. acidentatus[4] |
A skull (IGCAGS V 361) and fragmentary jaw bones |
Jr. synonym of Sinophoneus yumenensis |
||||
|
R. dashankouensis |
Dashankou locality | A partial skull | A basal therapsid. |
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Sauropsida
[edit | edit source]| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
|
B. zhengi |
A bolosaurid parareptile | |||||
|
G. qingtoushanensis |
A captorhinid |
Chronisuchia
[edit | edit source]| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Phratochronis | P. qilianensis | A Chroniosuchid | ||||
| Ingentidens | I. corridoricus | A Chroniosuchid |
Temnospondyli
[edit | edit source]| Genus | Species | Location | Stratigraphic position | Material | Notes | Images |
|---|---|---|---|---|---|---|
| Anakamacops | A. petrolicus | A dissorophid temnospondyl |
References
[edit | edit source]- ^ Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ Liu J, Qinghua S, Keqin S, Lu L (2012) The horizon of Dashankou Fauna and the Permo-Triassic strata in northern Qilian area, China. Vertebr Palasiat 50(4):373–381 (In Chinese)
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
- ^ a b c d Lua error in Module:Citation/CS1/Configuration at line 2172: attempt to index field '?' (a nil value).
