Balabansai Formation

Balabansai Formation
Stratigraphic range: Bathonian-Callovian
~168–164 Ma
TypeGeological formation
UnderliesHodzhiabad Formation[1]
Cretaceous red beds
OverliesIgrysai Svita[1]
ThicknessUp to 250 m (820 ft)
Lithology
PrimarySandstone, siltstone, claystone
OtherGravel, marl
Location
Coordinates41°18′N 72°06′E / 41.3°N 72.1°E / 41.3; 72.1
Approximate paleocoordinates40°54′N 76°12′E / 40.9°N 76.2°E / 40.9; 76.2
RegionOngtustik Qazaqstan oblysy, Jalal-Abad Region
Country Kazakhstan
 Kyrgyzstan
 Uzbekistan
Balabansai Formation is located in Kyrgyzstan
Balabansai Formation
Balabansai Formation (Kyrgyzstan)

The Balabansai Formation (sometimes transcribed Balabansay,[1] also known as Balabansai Svita) is a geological formation in Kazakhstan, Kyrgyzstan and Uzbekistan whose strata date back to the Bathonian and Callovian stages of the Middle Jurassic. Dinosaur remains are among the fossils that have been recovered from the formation.[2] The lithology primarily consists of variegated sandstones, siltstones, claystones, and rare gravels and marls.[3] Many taxa have been found in the formation, including amphibians[4] and mammals.[5]

  1. ^ a b c De Pelsmaeker, Elien; Jolivet, Marc; Laborde, Amandine; Poujol, Marc; Robin, Cécile; Zhimulev, Fedor I.; Nachtergaele, Simon; Glorie, Stijn; De Clercq, Shana; Batalev, Vladislav Yu.; De Grave, Johan (2018). "Source-to-sink dynamics in the Kyrgyz Tien Shan from the Jurassic to the Paleogene: Insights from sedimentological and detrital zircon U-Pb analyses" (PDF). Gondwana Research. 54: 180–204. Bibcode:2018GondR..54..180D. doi:10.1016/j.gr.2017.09.004. ISSN 1342-937X.
  2. ^ Weishampel, David B; et al. (2004). "Dinosaur distribution (Late Jurassic, Asia)." In: Weishampel, David B.; Dodson, Peter; and Osmólska, Halszka (eds.): The Dinosauria, 2nd, Berkeley: University of California Press. Pp. 550–552. ISBN 0-520-24209-2.
  3. ^ AVERIANOV, ALEXANDER O.; MARTIN, THOMAS; BAKIROV, AIZEK A. (January 2005). "Pterosaur and dinosaur remains from the Middle Jurassic Balabansai Svita in the northern Fergana Depression, Kyrgyzstan (Central Asia)". Palaeontology. 48 (1): 135–155. Bibcode:2005Palgy..48..135A. doi:10.1111/j.1475-4983.2004.00437.x. ISSN 0031-0239. S2CID 55249438.
  4. ^ Skutschas, Pavel P. (2013-10-01). "Mesozoic salamanders and albanerpetontids of Middle Asia, Kazakhstan, and Siberia". Palaeobiodiversity and Palaeoenvironments. 93 (4): 441–457. Bibcode:2013PdPe...93..441S. doi:10.1007/s12549-013-0126-8. ISSN 1867-1594. S2CID 140159226.
  5. ^ Martin, Thomas; Averianov, Alexander O. (2010-05-18). "Mammals from the Middle Jurassic Balabansai Formation of the Fergana Depression, Kyrgyzstan". Journal of Vertebrate Paleontology. 30 (3): 855–871. Bibcode:2010JVPal..30..855M. doi:10.1080/02724631003758045. ISSN 0272-4634. S2CID 128716878.