Zhirkindek Formation

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Zhirkindek Formation
Stratigraphic range: Turonian-Coniacian
~92–88  Ma
O
S
D
C
P
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Pg
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Type Geological formation
Underlies Bostobe Formation
ThicknessAt least 42 m (138 ft)
Lithology
Primary Sandstone
Other Claystone, siltstone
Location
Coordinates 46°12′N64°12′E / 46.2°N 64.2°E / 46.2; 64.2
Approximate paleocoordinates 41°00′N57°18′E / 41.0°N 57.3°E / 41.0; 57.3
Region Qyzylorda
CountryFlag of Kazakhstan.svg  Kazakhstan
Relief Map of Kazakhstan.png
Lightgreen pog.svg
Zhirkindek Formation (Kazakhstan)

The Zhirkindek Formation is a Late Cretaceous geologic formation in Kazakhstan. [1] The primary lithology is sand with interbeds of clay and silt, and represents a coastal to coastal marine environment. [2] The formation has produced numerous fossils, including Lindholmemydid and Trionychid cryptodires, indeterminate remains of dinosaurs (Ankylosauridae indet., Hadrosauroidea indet., Neoceratopsia indet., Sauropoda indet., Tyrannosauroidea indet., Ornithomimidae indet., Therizinosauroidea indet and Dromaeosauridae indet) and an indeterminate species of pterosaur Azhdarcho . [3]

See also

Related Research Articles

<i>Aralosaurus</i> Extinct genus of dinosaurs

Aralosaurus was a genus of hadrosaurid dinosaur that lived during the Late Cretaceous in what is now Kazakhstan. It is known only by a posterior half of a skull and some post-cranial bones found in the Bostobe Formation in rocks dated from the Upper Santonian-Lower Campanian boundary, at about 83.6 Ma. Only one species is known, Aralosaurus tuberiferus, described by Anatoly Konstantinovich Rozhdestvensky in 1968. The genus name means Aral Sea lizard, because it was found to the northeast of the Aral Sea. The specific epithet tuberiferus means bearing a tuber because the posterior part of the nasal bone rises sharply in front of the orbits like an outgrowth. Aralosaurus was originally reconstituted with a nasal arch similar to that of North American Kritosaurus. For many years, Aralosaurus was thus placed in the clade of the Hadrosaurinae. This classification was invalidated in 2004, following the re-examination of the skull of the animal which allowed to identify in Aralosaurus many typical characters of Lambeosaurinae. In particular, this study revealed that Aralosaurus had a hollow bony structure located far in front of the orbits, which communicated with the respiratory tract. This structure being broken at its base, its shape and size remains undetermined. More recently, Aralosaurus has been identified as the most basal Lambeosaurinae, and placed with its close relative Canardia from the upper Maastrichtian of France in the new clade of Aralosaurini.

<span class="mw-page-title-main">Azhdarchidae</span> Family of large azhdarchoid pterosaurs

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<i>Aralazhdarcho</i> Genus of azhdarchid pterosaur from the Late Cretaceous

Aralazhdarcho is a genus of azhdarchid pterosaur from the Santonian to the early Campanian stages of the Late Cretaceous period of Bostobe Svita in Kazakhstan. The type and only known species is Aralazhdarcho bostobensis.

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<span class="mw-page-title-main">Aralosaurini</span>

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References

  1. Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database" . Retrieved 17 December 2021.
  2. Kordikova, E. G.; Polly, P. D.; Alifanov, V. A.; Roček, Z.; Gunnell, G. F.; Averianov, A. O. (March 2001). "Small vertebrates from the late Cretaceous and early Tertiary of the northeastern Aral Sea region, Kazakhstan". Journal of Paleontology. 75 (2): 390–400. doi:10.1017/S0022336000018187. ISSN   0022-3360.
  3. Averianov, Alexander; Dyke, Gareth; Danilov, Igor; Skutschas, Pavel (2015-02-20). "The paleoenvironments of azhdarchid pterosaurs localities in the Late Cretaceous of Kazakhstan". ZooKeys (483): 59–80. Bibcode:2015ZooK..483...59A. doi: 10.3897/zookeys.483.9058 . ISSN   1313-2970. PMC   4351447 . PMID   25755624.