Tsagaantsav Formation Stratigraphic range: Hauterivian-Barremian 131–126 Ma | |
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Type | Geological formation |
Underlies | Zuunbayan Formation, Shinekhudag Formation |
Overlies | Basement |
Lithology | |
Primary | Sandstone, siltstone |
Location | |
Coordinates | 44°54′N110°24′E / 44.9°N 110.4°E Coordinates: 44°54′N110°24′E / 44.9°N 110.4°E |
Approximate paleocoordinates | 46°42′N112°18′E / 46.7°N 112.3°E |
Region | Khovd, Uvs, Dornogovi & Övörkhangai Provinces |
Country | |
Type section | |
Named for | Tsagan-Tsab well |
The Tsagaantsav Formation, Tsagantsab Formation or Tsagan-Tsab Formation (Russian: Tsagaantsav Svita) is an Early Cretaceous (Hauterivian to Barremian) geologic formation in Mongolia. [1] Indeterminate sauropod and psittacosaurid remains have been recovered from the formation. [2] Remains of the pterosaur Noripterus , which were originally given their own genus, "Phobetor" have also been recovered from the formation. [3] [4]
Graham et al. 2001 reported radiometric dates of 131 and 126 Ma from the formation. [5]
The following fossils were reported from the fluvial to lacustrine sandstones and siltstones of the formation: [1]
Noripterus is a genus of dsungaripterid pterodactyloid pterosaur from Lower Cretaceous-age Lianmuqin Formation in the Junggar Basin of Xinjiang, China. It was first named by Yang Zhongjian in 1973. Additional fossil remains have been recovered from Tsagaantsav Svita, Mongolia.
The Ejinhoro Formation is a geological formation in Inner Mongolia, north China, whose strata date back to the Early Cretaceous period (Aptian/Albian age.
The Ashizawa Formation is a Coniacian geologic formation in northeastern Honshu, Japan. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus. A jawbone belonging to a therian mammal has also been discovered from this unit.
The Baiying Bologai Formation, in other literature named Bayan Bologai Formation, is an Early Cretaceous geologic formation in the Ömnögovi Province of Mongolia. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.
The Birdrong Sandstone is an Early Cretaceous geologic formation of the Barrow Group in Western Australia. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.
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The Luohandong Formation is an Early Cretaceous geologic formation of the Ordos Basin in Inner Mongolia, China. The formation was initially dated to the earliest Cretaceous; Valanginian to Barremian, but later dating established an Aptian to Albian age. Dinosaur remains are among the fossils that have been recovered from the formation. Pterosaur fossils have also been recovered from the formation.
The Early Cretaceous Phu Kradung Formation is the lowest member of the Mesozoic Khorat Group which outcrops on the Khorat Plateau in Isan, Thailand. This geological formation consists of micaceous, brown to reddish-brown siltstone beds with minor brown and grey shale and sandstone beds. Occasional lime-noduled conglomerate occurs.
The Sebayashi Formation is a Barremian to Albian geologic formation in Japan. Dinosaur remains are among the fossils that have been recovered from the formation, although only one species, Siamosaurus, has been referred to a specific genus.
The Ulan Malgait Formation is a Late Jurassic geologic formation in Mongolia. Dinosaur remains are among the fossils that have been recovered from the formation, although as of 2004 none have yet been referred to a specific genus.
The Speeton Clay Formation (SpC) is a Lower Cretaceous geologic formation in Yorkshire, northern England. The most common fossils in the unit are belemnites, followed by ammonites and the lobster Meyeria ornata. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.
The Tahora Formation is a Late Cretaceous geologic formation that outcrops in northeastern New Zealand near Gisborne. It is Haumurian in age according to the New Zealand geologic time scale. It forms part of the Upper Cretaceous to Teurian (Danian) Tinui Group. It unconformably overlies the Jurassic to Lower Cretaceous Urewera Group or the Upper Cretaceous Matawai Group. It is conformably overlain by the Haumurian to Teurian Whangai Formation. It consist of three members, the Maungataniwha Sandstone Member, the Mutuera Member and the Houpapa Member. It is named for Tahora Station, south of Matawai in the Gisborne Region. The aptly named Maungataniwha Sandstone Member is known for its rich reptile fossil remains, first investigated by amateur palaeontologist Joan Wiffen.
The Gugyedong Formation, also known as the Guyedong Beds, is an Aptian to Albian geologic formation in South Korea. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.
The Andaikhudag Formation, in older literature referred to as Unduruh Formation or Ondorukhaa Formation, is an Early Cretaceous geologic formation in Mongolia. Dinosaur remains diagnostic to the genus level are among the fossils that have been recovered from the formation.
The Akaiwa Formation is an Early Cretaceous (Hauterivian-Barremian) geologic formation in central Honshu, Japan. Indeterminate ornithischian fossils are known from the formation. Fossil ornithopod tracks have been reported from the formation. As well as the turtle Kappachelys
The Ialovachsk or Yalovach Formation is a Santonian geologic formation in Kyrgyzstan, Tajikistan and Uzbekistan. Fossil dinosaur eggs have been reported from the formation.
The Jobu Formation is a Cretaceous geologic formation of Late Cenomanian age. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus. The oldest confirmed tyrannosaurid premaxillary tooth was recovered from the Jobu Formation. The mammal Sorlestes is also known from the formation.
The Alamyshik Formation is a geological formation in Kyrgyzstan whose strata date back to the Albian stage of the Early Cretaceous. Pterosaur remains are among the fossils that have been recovered from the formation.
The Argiles de Châtillon is a geologic formation in France. It preserves fossils dating back to the Jurassic period. Dinosaur remains are among the fossils that have been recovered from the formation, although none have yet been referred to a specific genus.
The Dushihin Formation is an Early Cretaceous (Aptian) geologic formation in the Övörkhangai Province of Mongolia. The formation preserves fossils of Psittacosaurus mongoliensis and fossil eggs described as Trachoolithus faticanus.