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Alagteeg Formation

stratigraphic Unit in Mongolia

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Record originEnglish Wikipedia
Text licenseCC BY-SA 4.0
Source revisionJun 18, 2026
Entity authorityQ4879426 ↗
Source-derived summary

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. 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 a sandy braided river, floodplain and ephemeral lake depositional environments, as opposed to the desert depositional environment of the Djadochta Formation.

Fossil content

Dinosaurs

Sauropoda

Ornithischians

Turtles

See also

List of dinosaur-bearing rock formations

References

Bibliography

Averianov, Alexander O.; Lopatin, Alexey V. (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

Hasegawa, Hitoshi; Tada, Ryuji; Ichinnorov, Niiden; Minjin, Chuluun (2009), "Lithostratigraphy and depositional environments of the Upper Cretaceous Djadokhta Formation, Ulan Nuur basin, southern Mongolia, and its paleoclimatic implication", Journal of Asian Earth Sciences, 35 (1): 13–26, Bibcode:2009JAESc..35...13H, doi:10.1016/j.jseaes.2008.11.010

Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp.

Editorial summary

This brief starts where responsible research should: with the source description of “Alagteeg Formation” as stratigraphic Unit in Mongolia. Everything that follows is an evidence route, not borrowed authority.

Editorial reviewA practical starting point whose main value is the path it opens into stronger specialist and primary sources. The current lead gives the account dated anchors—2008, 2020, 1009, 1032—that can be checked directly. The selected authority fields contribute no independent date. The account is most persuasive where Alagteeg, Formation and stratigraphic can be independently traced.
Editorial analysis

Why this record matters

The subject matters to the general reference register because the source frames it as stratigraphic Unit in Mongolia. Its deeper value depends on whether names, dates, institutions and citations support that framing.

Evidence profile

The citation trail is more important than the brevity of the summary: it shows where individual claims can be examined in context. The source revision retrieved here is dated Jun 18, 2026. The linked authority identifier is Q4879426. Authority coordinates are 44.300, 103.300. None of the 1 selected statements returned an explicit reference. The first chronological checks are 2008, 2020, 1009 and 1032.

Critical limits

The absence of detail may reflect summary conventions rather than a lack of surviving documentation. The lead is largely declarative, so disagreement and counter-evidence require a deliberate search beyond the opening account. Authority statements aid reconciliation but still require their own references, qualifiers and ranks to be checked.

How to read it

Use the entry as an orientation point, then follow its citations and revision history. Names, dates and institutional relationships should be checked against the original record.

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Source & attribution

This entry incorporates text from “Alagteeg Formation” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.