Bissekty Formation
| Bissekty Formation | |
|---|---|
Ma | |
| Type | Xorazm Regions |
| Country |  Uzbekistan |
| Extent | Kyzylkum Desert |
  Bissekty Formation (Uzbekistan) | |
The Bissekty Formation (sometimes referred to as Bissekt) is a
Period. Laid down in the mid to late Turonian, it is dated to about 92 to 90 Ma (million years ago).[1]
Description
The lithology of the sediment largely consists of cross bedded sandstones with interbeds of massive sandstone, well cemented intraformational conglomerate, siltstones and mudstones. Most of the fossils are found as clasts within the conglomerates.[2]
Fossil content
The Bissekty Formation is characterised by a mix of
freshwater, and terrestrial animal fossils. This stands in contrast the strictly marine fossils found in the underlying Dzheirantui Formation, and indicates that the Bissekty was formed during the regression of a saltwater sea. The coastline expanded inland again in the upper portion of the Bissekty, represented by a proportional increase of fully aquatic species, which were almost completely absent from the middle period of the formation. Semi-aquatic species remained abundant during this middle period, and the geology of the formations indicates that a braided river system took the place of the coastline. Eventually the area was again completely underwater, during the time period represented by the later Aitym Formation, which preserves coastal marine sediments.[2]
Vertebrates
The Bissekty Formation is notable for preserving the most abundant Turonian land animal fossils in Eurasia, and the most diverse fauna of Late Cretaceous eutherians (placental mammals and relatives) in the world.[2]
Listings and accompanying information are based on a survey of the Bissekty Formation published by Cory Redman and Lindsey Leighton in 2009 unless otherwise noted.freshwater unless otherwise noted.
Amphibians
An indeterminate species of salamander-like albanerpetontid amphibian. An indeterminate gobiatid species.
Amphibians of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
| Aralobatrachus | A. robustus | A frog | ||||
| Eoscapherpeton | E. asiaticum | A scapherpetontid salamander | ||||
| Gobiates | G. sosedkoi | A gobiatid frog | ||||
| Gobiates spp. | Additional indeterminate species of Gobiates | |||||
| Itemirella | I. cretacea | A possible discoglossid frog
| ||||
| Kizylkuma | K. antiqua | A possible discoglossid marine frog | ||||
Mynbulakia
|
M. surgai | A batrachosauroidid salamander | ||||
Cartilaginous fish
Cartilaginous fishes of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Cretodus | C. crassidens | A marine Lamniform shark
|
 | |||
Heterodontus
|
Indeterminate | A marine bullhead shark |
.JPG) | |||
| Hispidaspis | Indeterminate | A sand shark tolerant of brackish water | ||||
| Hybodus | Indeterminate | A hybodontid tolerant of brackish water
|
 | |||
| Ischyrhiza | I. serra | A sclerorhynchid tolerant of brackish water
|
 | |||
| Myledaphus | M. tritus | A rhinobatoid tolerant of brackish water |
 | |||
| Polyacrodus | Indeterminate | A polyacrodontid tolerant of brackish water | ||||
| Scapanorhynchus | S. rhaphiodon | A goblin shark tolerant of brackish water |  | |||
Crocodylomorphs
| Crocodylomorphs of the Bissekty Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
| Kansajsuchus | K. borealis | A possible goniopholidid mesoeucrocodylian | ||||
| Tadzhikosuchus | T. macrodentis | A possible alligatoroid eusuchian
| ||||
| Zholsuchus | Z. procevus | A possible mesoeucrocodylian | ||||
| Zhyrasuchus | Z. angustifrons | A possible eusuchian | ||||
Lizards
An indeterminate gekkonid. An indeterminate priscagamid. An indeterminate scincid.
| Lizards of the Bissekty Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
| Buckantaus | B. crassidens | A macrocephalosaurid | ||||
| Ekshmer | E. bissektensis | A priscagamid | ||||
Mammals and other therapsids
| Mammaliaformes of the Bissekty Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
| Aspanlestes | A. aptap | A zhelestid | ||||
| Bulaklestes | B. kezbe | An asioryctitherian | ||||
| Daulestes | D. inobservabilis | An asioryctitherian | ||||
| D. kulbeckensis | An asioryctitherian | |||||
| Eoungulatum | E. kudukensis | A zhelestid | ||||
| Kulbeckia | K. kulbecke | A zalambdalestid | ||||
| Paranyctoides | P. quadrans | An eutherian | ||||
| Parazhelestes | P. mynbulakensis | A zhelestid | ||||
| P. robustus | A zhelestid | |||||
| Shalbaatar | S. bakht | A symmetrodont | ||||
| Sulestes | S. karakshi | A deltatheroid | ||||
| Uchkudukodon | U. nessovi | An asioryctitherian | ||||
| Uzbekbaatar | U. kizylkumensis | A cimolodont | ||||
| Zhelestes | Z. temirkazyk | A zhelestid | ||||
Plesiosaurs
Plesiosaurs of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
Plesiosauria
|
Indeterminate | Marine, possibly tolerant of brackish water
|
||||
Pterosaurs
Pterosaurs of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Azhdarcho | A. lancicollis | Dzhara-Kuduk | Taykarshinskaya unit | An azhdarchid |  | |
Ray-finned fish
An indeterminate acipenserid. An indeterminate albulid (bonefish) species. An indeterminate albulid (bonefish) species. An indeterminate pholidophoriform species.
Ray-finned fish of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | Images |
| Aidachar | A. paludalis | An ichthyodectiform tolerant of brackish water | ||||
| " Amia "
|
"A." limosa | A bowfin tolerant of brackish water, Nomen dubium[3] | ||||
| Atractosteus | A. turanensis | A gar tolerant of brackish water | ||||
| Belonostomus | B. aciculifer | An aspidorhynchid | ||||
| Psephuroides | P. kazakhorum | A paddlefish | ||||
Dinosaurs
Sauropods
| Sauropod dinosaurs of the Bissekty Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Description | Images |
| Dzharatitanis | D. kingi | An anterior caudal vertebra. | Originally described as a titanosaur[4]
|
|||
| Titanosauria | Indeterminate | CCMGE 628/12457, a braincase | ||||
Ornithischians
Color key
|
Notes Uncertain or tentative taxa are in small text; |
| Ornithischians reported from the Bissekty Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Description | Images |
| Amtosaurus | A. archibaldi[5] | Reclassified as Bissektipelta[6] | ||||
| Bactrosaurus | B. kyslkumensis | "Fragmentary dentary [=maxilla], vertebrae, tibia."[7] | Nomen dubium | |||
| Bissektipelta | B. archibaldi[6] | "Partial skull."[8] | An ankylosaur | |||
| Cionodon | C. kyslkumensis[5] | Reclassified as Bactrosaurus kyslkumensis[6] | ||||
| Gilmoreosaurus | G. arkhangelskyi | Nomen dubium | ||||
| Levnesovia | L. transoxiana | "Braincases" | A hadrosauroid | |||
| Turanoceratops[5] | T. tardabilis[5] | A ceratopsian[9] |  | |||
Theropods
An indeterminate tyrannosauroid species, known from isolated teeth.[10]
Charcharodontosaurid
Carcharodontosaurs of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Description | Images |
| Carcharodontosauridae | Indeterminate | A partial posterior dorsal vertebra[11] | ||||
| Ulughbegsaurus | U. uzbekistanensis | A left maxilla, the ramus end of a left maxilla, and the posterior end of a right maxilla. | A probable carcharodontosaurid theropod | |||
Enantiornithines
Enantiornithines of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Description | Images |
| Abavornis | A. bonaparti | Known from a partial coracoid[12] | A possible enantiornithine.[12] A possible second species of Abavornis in the Bissekty Formation is known from a partial coracoid.[12] | |||
| Catenoleimus | C. anachoretus | A possible enantiornithine | ||||
| Explorornis | E. nessovi | An enantiornithine. Possible third and fourth species of Explorornis in the Bissekty Formation are known from partial coracoids.[12] | ||||
| E. walkeri | "Coracoid"[13] | |||||
| Ichthyornis | I. minusculus | "Dorsal vertebra"[14] | An enantiornithine originally but incorrectly identified as a species of Ichthyornis.[15] | |||
| Incolornis | I. martini | Known from a partial coracoid[12] | A possible enantiornithine[12] | |||
| I. silvae | Known from a partial coracoid[12] | A possible enantiornithine[12] | ||||
| Kizylkumavis[5] | K. cretacea[5] | "Distal humerus"[13] | An enantiornithine | |||
| Kuszholia | K. mengi | "[Two] synsacra"[16] | An enantiornithine | |||
| Lenesornis[5] | L. maltshevskyi[5] | "Synsacrum"[13] | A possible enantiornithine | |||
| cf. Nanantius | An enantiornithine, similar to Nanantius eos | |||||
| Sazavis[5] | S. prisca[5] | "Distal tibiotarsus"[17] | An enantiornithine | |||
| Zhyraornis[5] | Z. kashkarovi[5] | "Synsacrum"[17] | ||||
| Z. logunovi[5] | "Synsacrum"[17] | |||||
Other Theropods
| Non-Enantiornithine Theropod dinosaurs of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Material | Description | Images |
| Caenagnathasia | C. martinsoni' | "[Two] partial mandibles"[18] | An caenagnathid
|
 | ||
| Dzharacursor | D. bissektensis | Right femur of a juvenile (holotype) with partial cranial and postcranial material[19] | An ornithomimosaur originally assigned to Archaeornithomimus. |  | ||
| Dzharaonyx | D. eski | An alvarezsaur | ||||
| Euronychodon | E. asiaticus | A possible troodontid based on isolated teeth[20][21][22] | ||||
| Itemirus | I. medullaris | A single small, damaged fossil braincase | A dromaeosaurine
|
 | ||
| Platanavis[5] | P. nana[5] | "Sacrum"[14] | ||||
Therizinosauroidea spp.[23]
|
Indeterminate | Partial crania also preserving some teeth and some postcranial elements including pedal bones (from multiple individuals) | At least two different therizinosauroids
|
|||
| Timurlengia[24] | T. euotica | Two braincases, dentary, and miscellaneous postcranial elements (from multiple individuals) | A non- tyrannosauroid
|
 | ||
| Urbacodon | Unnamed species | A troodontid, known from isolated teeth[25] |  | |||
| Zhyraornis | Z. kashkarovi | A possible ornithurine | ||||
Turtles
An indeterminate trionychid (soft-shell) turtle species that was tolerant of brackish water.
| Turtles of the Bissekty Formation | ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
| "Adocus" | "Adocus" aksary | An adocid tolerant of brackish water | ||||
| Anatolemys | Indeterminate | A "macrobaenid" tolerant of brackish water | ||||
| Khunnuchelys | K. kizylkumensis | A trionychid tolerant of brackish water | ||||
| Lindholmemys | L. elegans | A "lindholmemydid" tolerant of brackish water | ||||
| Shachemys | S. ancestralis | An adocid tolerant of brackish water | ||||
Invertebrates
An indeterminate species of marine coral.
Arthropods
Arthropods of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
| Linuparus | L. dzheirantuiensis | Marine
|
A spiny lobster | |||
Molluscs
An indeterminate species of marine placenticeratid ammonite. An indeterminate species of marine teredinid shipworm. An indeterminate marine trigoniid bivalve. An indeterminate marine veneroid bivalve.
Molluscs of the Bissekty Formation
| ||||||
|---|---|---|---|---|---|---|
| Genus | Species | Location | Stratigraphic position | Abundance | Notes | |
| Crassatelites | Indeterminate | A marine crassatellid bivalve | ||||
| Mytiloides | M. labiatus | A marine inoceramid bivalve | ||||
| Plagiostoma | Indeterminate | A marine limoid bivalve | ||||
| Quadratotrigonia | Indeterminate | A marine trigoniid bivalve | ||||
| Xylophaga | Indeterminate | An indeterminate species of marine shipworm | ||||
References
- ISSN 0195-6671.
- ^ a b c d Redman & Leighton, 2009
- doi:10.7934/p482.
- S2CID 236689007.
- ^ a b c d e f g h i j k l m n o "Dinosaur distribution (Bissekty Formation)." Weishampel, et al. (2004). Pg. 594.
- ^ a b c Averianov, 2002
- ^ "Table 20.1," in Weishampel, et al. (2004). Page 442.
- ^ "Table 17.1," in Weishampel, et al. (2004). Page 367.
- ^ Sues & Averianov, 2009
- ^ Archibald, James David; Sues, Hans-Dieter; Averianov, Alexander; King, Chris; Ward, David John; Tsaruk, Oleg; Danilov, Igor; Rezvyi, Anton; Veretennikov, Boris; Khodjaev, Anvar (1998). "Precis of the Cretaceous paleontology, biostratigtaphy and sedimentology at Dzharakuduk (Turonian?-Santonian), Kyzylkum Desert, Uzbekistan". Bulletin of the New Mexico Museum of Natural History and Science. 14: 21–27.
- ISSN 0891-2963.
- ^ a b c d e f g h Panteleev (1998). ""New species of enantiornithines (Aves: Enantiornithes) from the Upper Cretaceous of Central Kyzylkum." Russkii Ornitologicheskii Zhurnal". Ekspress-vy.PVSK. 35: 3–15.
- ^ a b c "Table 11.1," in Weishampel, et al. (2004). Page 213.
- ^ a b "Table 11.1," in Weishampel, et al. (2004). Page 216.
- ^ Kurochkin. (1996). "A new Enantiornithid of the Mongolian Late Cretaceous, and a general appraisal of the Infraclass Enantiornithes (Aves)." Russian Academy of Sciences, special issue: 50pp.
- ^ "Table 11.1," in Weishampel, et al. (2004). Page 212.
- ^ a b c "Table 11.1," in Weishampel, et al. (2004). Page 214.
- ^ "Table 8.1," in Weishampel, et al. (2004). Page 166.
- .
- ^ "Table 10.1," in Weishampel, et al. (2004). Page 199.
- ^ "Table 9.1," in Weishampel, et al. (2004). Page 185.
- ^ Nesov, A. (1995). "Dinosaurs of Northern Eurasia: new data about assemblages, ecology and paleobiogeography." Scientific Research Institute of the Earth's Crust. St. Petersburg State University, St. Petersburg, Russia: 156 pp. + 14 pl. [in Russian with short English, German, and French abstracts].
- .
- PMID 26976562.
- S2CID 9743271.
Bibliography
- Averianov, A.O (2002), "An ankylosaurid (Ornithischia: Ankylosauria) braincase from the Upper Cretaceous Bissekty Formation of Uzbekistan" (PDF), Bulletin de l'Institut Royal des Sciences Naturelles de Belgique, Sciences de la Terre, 72: 97–110, retrieved 2019-03-22
- Redman, C.M.; Leighton, L.R. (2009), "Multivariate faunal analysis of the Turonian Bissekty Formation: Variation in the degree of marine influence in temporally and spatially averaged fossil assemblages", , retrieved 2019-03-22
- Sues, H-D.; Averianov, A. (2016), "Ornithomimidae (Dinosauria: Theropoda) from the Bissekty Formation (Upper Cretaceous: Turonian) of Uzbekistan", , retrieved 2019-03-22
- Sues, H.-D.; Averianov, A. (2009), "Turanoceratops tardabilis—the first ceratopsid dinosaur from Asia", PMID 19277598, retrieved 2019-03-22
- Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, )
Further reading
- Averianov, A.O.; Archibald, J.D.; Ekdale, E.G. (2010), "New material of the Late Cretaceous deltatheroidan mammal Sulestes from Uzbekistan and phylogenetic reassessment of the metatherian-eutherian dichotomy", , retrieved 2019-03-22
- Averianov, A.O (2007), "New records of azhdarchids (Pterosauria, Azhdarchidae) from the Late Cretaceous of Russia, Kazakhstan, and Central Asia", , retrieved 2019-03-22
- Feldmann, R.M.; Schweitzer, C.E.; Redman, C.M.; Morris, N.J.; Ward, D.J. (2007), "New Late Cretaceous lobsters from the Kyzylkum Desert of Uzbekistan", , retrieved 2019-03-22
- Storrs, G.W.; Efimov, M.B. (2000), Mesozoic crocodyliforms of north-central Eurasia, In M. J. Benton, M. A. Shishkin, D. M. Unwin, E. N. Kurochkin (eds.), The Age of Dinosaurs in Russia and Mongolia, pp. 402–419, retrieved 2019-03-22
- Sues, H.-D.; Averianov, A. (2014), "Dromaeosauridae (Dinosauria: Theropoda) from the Bissekty Formation (Upper Cretaceous: Turonian) of Uzbekistan and the phylogenetic position of Itemirus medullaris Kurzanov, 1976", , retrieved 2019-03-22
- Zelenkov, N. V.; Averianov, A. O. (2011), "Synsacrum of a primitive bird from the Upper Cretaceous of Uzbekistan",