The Bakhar Formation (Russian: Bakhar Svita) is a geological formation in Mongolia whose strata date back to the Aalenian to Bathonian stages of the Middle Jurassic, comprising claystones deposited in a lacustrine environment.[1]
| Bakhar Formation | |
|---|---|
| Stratigraphic range: Aalenian-Bathonian ~ | |
| Type | Geological formation |
| Lithology | |
| Primary | Claystone |
| Other | Coal |
| Location | |
| Coordinates | 44°54′N 100°54′E / 44.9°N 100.9°E |
| Approximate paleocoordinates | 48°06′N 105°12′E / 48.1°N 105.2°E |
| Country |  Mongolia |
| Extent | North Molasse Basin |
   Bakhar Formation (Mongolia) | |
Fossil content
editInsects; Platyperla propera,[2] Ano da, A. net, A. nym, Blattula anuniversala, B. bacharensis, B. flamma, B. mikro, B. mini, B. universala, B. velika, B. vulgara, Caloblattina vremeni, Dostavba pre, Hra disko, H. bavi, H. nie, Nuurcala cela, Okras sarko, Perlucipecta cosmopolitana, Polliciblattula analis, P. tatosanerata, P. vana, Praeblattella jurassica, Raphidiomima chimnata, R. krajka, Rhipidoblattina bakharensis, R. konserva, R. sisnerahkab, Solemnia togokhudukhensis, Truhla vekov,[3] fish (Palaeonisciformes) and pterosaur remains of the family Anurognathidae have been recovered from the formation.[4][5] The formation has also provided many fossil flora in its coal layers, known as the Tsagan-Ovoo Flora containing 32 megafossil plant taxa belonging to horsetails, ferns, cycadaleans, ginkgoaleans, leptostrobaleans, conifers and gymnosperms. Three new species were named; Ginkgo badamgaravii, Pseudotorellia gobiense and P. mongolica.[6]
See also
edit- List of pterosaur-bearing stratigraphic units
- Balabansai Formation, contemporaneous fossiliferous formation of Central Asia
- Itat Formation, contemporaneous fossiliferous formation of Russia
- Ukureyskaya Formation, contemporaneous fossiliferous formation of Russia
- Tiaojishan Formation, contemporaneous fossiliferous formation of China
References
edit- ^ Bakhar Formation at Fossilworks.org
- ^ Sinitshenkova, 1987
- ^ Vršanský, 2020
- ^ Bakhurina & Unwin, 1995
- ^ Barret et al., 2008
- ^ Kostina et al., 2015
Bibliography
edit- Vršanský, Peter (2020), "New assemblages of the Bakhar locality", in Peter Vršanský (ed.), Cockroaches from Jurassic sediments of the Bakhar Formation in Mongolia, SpringerBriefs in Animal Sciences, Springer, pp. 33–62, doi:10.1007/978-3-030-59407-7_4, ISBN 978-3-030-59406-0
- Kostina, Elena I.; Herman, Alexei B.; Kodrul, Tatiana M. (2015), "Early Middle Jurassic (possibly Aalenian) Tsagan-Ovoo Flora of Central Mongolia", Review of Palaeobotany and Palynology, 220: 44–68, Bibcode:2015RPaPa.220...44K, doi:10.1016/j.revpalbo.2015.04.010, retrieved 2020-07-09
- Barrett, P.M.; Butler, R.J.; Edwards, N.P.; Milner, A.R. (2008), "Pterosaur distribution in time and space: an atlas in Flugsaurier: Pterosaur papers in honour of Peter Wellnhofer" (PDF), Zitteliana B, 28: 61–107
- Bakhurina, N.N.; Unwin, D.M. (1995), "A survey of pterosaurs from the Jurassic and Cretaceous of the former Soviet Union and Mongolia", Historical Biology, 10 (3): 197–245, Bibcode:1995HBio...10..197B, doi:10.1080/10292389509380522
- Sinitshenkova, N.D (1987), "Istopicheskoe razvitie vesiyanok", Akademiya Nauk SSSR, Trudy Paleontologicheskogo Instituta, 221: 1–142