Qigu Formation | |
---|---|
Stratigraphic range:
Oxfordian-Early
Kimmeridgian, | |
Type | Geological formation |
Underlies | Kalaza Formation |
Overlies | Toutunhe Formation (Junggar) Qiketai Formation (equivalent unit in the Turpan Basin) |
Thickness | Over 520 m (1,710 ft) |
Lithology | |
Primary | Siltstone, sandstone |
Location | |
Coordinates | 43°36′N 87°18′E / 43.6°N 87.3°E |
Approximate paleocoordinates | 42°54′N 97°30′E / 42.9°N 97.5°E |
Region | Xinjiang |
Country | China |
Extent | Southern
Junggar Basin (blue) Turpan Basin (disputed) (cyan) |
The Qigu Formation is a Late Jurassic ( Oxfordian) geologic formation in the Southern Junggar Basin in China. Indeterminate Dinosaur remains are among the fossils that have been recovered from the formation, including theropod teeth and a fibula. [1] a stegosaur dorsal vertebra [2] and a Eusauropod tooth. [3] Xinjiangtitan was erroneously thought to be from this formation, but it is actually from the older Qiketai Formation, which is in a different basin. [4] The term "Qigu Formation" is also used to sediments of equivalent age in the Turpan Basin, but this might better be treated as a separate formation. It is laterally equivalent to the Shishugou Formation.
The mass accumulation of Jurassic freshwater turtle fossils belonging to the genus Annemys, discovered in 2009 at a site nicknamed " Mesa Chelonia" in Shanshan County, Xinjiang is thought to likely belong to the Qigu Formation, though it belongs to the strata of the Turpan Basin. [5] [6] Remains of indeterminate dinosaurs, including ankylosaurs, metriacanthosaurids, and dromaeosaurids are known from the formation. [7] [8] [9]
The remains of indeterminate rhamphorhynchid pterosaurs have been recovered from the formation. Among others, the following fossils have been found in the formation: [10]
Crocodyliformes | ||||||
---|---|---|---|---|---|---|
Taxa | Species | Material | Location | Notes | Images | |
Nominosuchus | Indeterminate | Liuhuanggou bonebed | ||||
Sunosuchus | ||||||
Theriosuchus |
Mammaliamorphs [11] | ||||||
---|---|---|---|---|---|---|
Taxa | Species | Material | Location | Notes | Images | |
Nanolestes | N. mackennai | Liuhuanggou bonebed | ||||
Tegotherium | Indeterminate | |||||
Dsungarodon | D. zuoi | Docodontan | ||||
Sineleutherus | S. uyguricus | |||||
Eutriconodonta | Indeterminate |
Qigu Formation | |
---|---|
Stratigraphic range:
Oxfordian-Early
Kimmeridgian, | |
Type | Geological formation |
Underlies | Kalaza Formation |
Overlies | Toutunhe Formation (Junggar) Qiketai Formation (equivalent unit in the Turpan Basin) |
Thickness | Over 520 m (1,710 ft) |
Lithology | |
Primary | Siltstone, sandstone |
Location | |
Coordinates | 43°36′N 87°18′E / 43.6°N 87.3°E |
Approximate paleocoordinates | 42°54′N 97°30′E / 42.9°N 97.5°E |
Region | Xinjiang |
Country | China |
Extent | Southern
Junggar Basin (blue) Turpan Basin (disputed) (cyan) |
The Qigu Formation is a Late Jurassic ( Oxfordian) geologic formation in the Southern Junggar Basin in China. Indeterminate Dinosaur remains are among the fossils that have been recovered from the formation, including theropod teeth and a fibula. [1] a stegosaur dorsal vertebra [2] and a Eusauropod tooth. [3] Xinjiangtitan was erroneously thought to be from this formation, but it is actually from the older Qiketai Formation, which is in a different basin. [4] The term "Qigu Formation" is also used to sediments of equivalent age in the Turpan Basin, but this might better be treated as a separate formation. It is laterally equivalent to the Shishugou Formation.
The mass accumulation of Jurassic freshwater turtle fossils belonging to the genus Annemys, discovered in 2009 at a site nicknamed " Mesa Chelonia" in Shanshan County, Xinjiang is thought to likely belong to the Qigu Formation, though it belongs to the strata of the Turpan Basin. [5] [6] Remains of indeterminate dinosaurs, including ankylosaurs, metriacanthosaurids, and dromaeosaurids are known from the formation. [7] [8] [9]
The remains of indeterminate rhamphorhynchid pterosaurs have been recovered from the formation. Among others, the following fossils have been found in the formation: [10]
Crocodyliformes | ||||||
---|---|---|---|---|---|---|
Taxa | Species | Material | Location | Notes | Images | |
Nominosuchus | Indeterminate | Liuhuanggou bonebed | ||||
Sunosuchus | ||||||
Theriosuchus |
Mammaliamorphs [11] | ||||||
---|---|---|---|---|---|---|
Taxa | Species | Material | Location | Notes | Images | |
Nanolestes | N. mackennai | Liuhuanggou bonebed | ||||
Tegotherium | Indeterminate | |||||
Dsungarodon | D. zuoi | Docodontan | ||||
Sineleutherus | S. uyguricus | |||||
Eutriconodonta | Indeterminate |