Alagteeg Formation

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Alagteeg Formation
Stratigraphic range: Santonian-Campanian
~85–72  Ma
Type Geological formation
Underlies Djadochta Formation
Thickness~16 m (52 ft) at the Bayan Zag locality
Lithology
Primary Sandstone, mudstone
Location
Coordinates 44°18′N103°18′E / 44.3°N 103.3°E / 44.3; 103.3
Approximate paleocoordinates 41°54′N92°24′E / 41.9°N 92.4°E / 41.9; 92.4
Region Ömnögovi Province
Country Mongolia
Extent Ulaan Nuur Basin
Type section
Named forAlag Teeg
Named byHasegawa et al.
Year defined2009
Thickness at type section~15 m (49 ft)
Relief map of Mongolia.png
Lightgreen pog.svg
Alagteeg Formation (Mongolia)

The Alagteeg Formation is a geological formation in Mongolia whose strata date back to the Late Cretaceous. Dinosaur remains are among the fossils that have been recovered from the formation. [1] It predominantly consists of alternating reddish brown mudstone and horizontally laminated sandstone, with ripple cross laminations and rhizoliths. It was first formally defined as a unit by Hasegawa et al. in 2008 as a distinct unit from the overlying Djadochta Formation. The environment of deposition is suggested to be fluvial, originating in sandy braided river, floodplain and ephemeral lake depositional environments, as opposed to the desert depositional environment of the Djadochta Formation. [2]

Contents

Fossil content

Color key
Taxon Reclassified taxonTaxon falsely reported as presentDubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Dinosaurs

Sauropoda

GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Abdarainurus [3] A. barsboldiA titanosaurian sauropod Abdarainurus Size Comparison.svg

Ornithischians

GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Pinacosaurus [1] P. grangeriA ankylosaurid thyreophoran
Plesiohadros P. djadokhtaensisA hadrosauroid ornithopod
Protoceratops [1] P. andrewsiA protoceratopsid ceratopsian

Turtles

Turtles of the Alagteeg Formation
GenusSpeciesLocationStratigraphic positionMaterialNotesImages
Trionychidae Indet.Indeterminate

See also

References

  1. 1 2 3 Weishampel et al., 2004, pp.593-600
  2. Hasegawa et al., 2009
  3. Alexander O. Averianov; Alexey V. Lopatin (2020). "An unusual new sauropod dinosaur from the Late Cretaceous of Mongolia". Journal of Systematic Palaeontology. 18 (12): 1009–1032. Bibcode:2020JSPal..18.1009A. doi:10.1080/14772019.2020.1716402. S2CID   214244529.

Bibliography