earth science

Ulaanoosh Formation

Ulaanoosh Formation is a earth science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Ulaanoosh Formation rather than just read about it. In short: The Ulaanoosh Formation, formerly Baruunbayan Formation, is a geologic formation in the Ömnögovi Province of southern Mongolia. The formation dates to the Albian to Cenomanian stages of the Cretaceous.

Key takeaways

Ulaanoosh Formation belongs to earth science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Ulaanoosh Formation to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Ulaanoosh Formation from memory before moving on to harder problems.

Reference excerpt

The Ulaanoosh Formation, formerly Baruunbayan Formation, is a geologic formation in the Ömnögovi Province of southern Mongolia. The formation dates to the Albian to Cenomanian stages of the Cretaceous. The Ulaanoosh Formation has provided fossils of dinosaurs, turtles and dinosaur eggs assigned to Parafaveoloolithus sp.. In 2020, the neoceratopsian Beg tse was described from the alluvial sandstones, mudstones and conglomerates of the formation.

Description The Ulaanoosh Formation was formerly considered to be the Baruunbayan Formation (or Baruunbayan Svita in Russian or Mongolian), first documented by the Soviet-Mongolian Paleontological Expeditions between 1946 and 1949. These beds are now considered to be part of the Ulaanoosh Formation. Shuvalov (1982) recognized the red beds at Baruunbayan based on exposures near mountains adjacent to the towns of Baruunbayan and Zuunbayan. Later, the Baruunbayan Svita was more thoroughly studied during a large geological mapping project carried out in the same area by a variety of studies. Due to insufficient representation (only partial sections are exposed at these localities), Badamgarav et al. in 1995 proposed that the Ulaanoosh Formation represents a complete section of red beds in the Baruunbayan area based on drill logs. The Ulaanoosh Formation is distributed in the areas of Ulaanoosh, Alguu Ulaan Tsav, Baruunbayan, and Zuunbayan. The age of the Ulaanoosh Formation ranges from late Early to early Late Cretaceous (Albian-Cenomanian) based on vertebrate and invertebrate fossils such as dinosaurs, dinosaur eggs, molluscs, ostracods, and turtles. The Ulaanoosh Formation is composed of two members: a lower and an upper. The lower member (Aptian to Albian) comprises white-colored mudstones, fine-grained conglomerates, bright gray colored, carbonate-rich sandstones, yellowish fine-grained sandstones with carbonate concretions and gray colored conglomerates preserving invertebrate fossils. The upper member is largely composed of reddish colored, fine to medium grained mudstones, fine-medium grained conglomerates, and a breccia layer in the base. The upper member of the formation preserved fragmentary sauropods and dinosaur eggs Faveoloolithus.

Age Absolute ages and stratigraphic correlation among many Gobi Desert localities are difficult to investigate and hindered by a lack of detailed geological mapping and sediments suitable for radiometric dating. The rock matrix embedding Beg is similar to sediments of the lowest upper member of Ulaanoosh Formation in being composed of reddish-brown conglomerate-breccia and sandstones. This suggests the age of this specimen can be constrained between 113~94 Ma, most likely at the boundary between Early and Late Cretaceous (~100.5 Ma).

Fossil content The following fossils have been reported from the formation:

See also List of dinosaur-bearing rock formations Alagteeg Formation Khuren Dukh Formation

References

Bibliography Yu, Congyu; Prieto Márquez, Albert; Chinzorig, Tsogtbaatar; Badamkhatan, Zorigt; Norell, Mark (2020), "A neoceratopsian dinosaur from the Early Cretaceous of Mongolia and the early evolution of Ceratopsia", Communications Biology, 3 (1): 1–8, doi:10.1038/s42003-020-01222-7, PMC 7484756, PMID 32913206 D'Emic, M. D (2012), "The early evolution of titanosauriform sauropod dinosaurs", Zoological Journal of the Linnean Society, 166 (3): 624–671, doi:10.1111/j.1096-3642.2012.00853.x, hdl:2027.42/94293 Zhang, S.-K (2010), "A parataxonomic revision of the Cretaceous faveoloolithid eggs of China", Vertebrata PalAsiatica, 48: 203–219 Danilov, I. G.; Syromyatnikova, E. V. (2008), "New materials on turtles of the family Nanhsiungchelyidae from the Cretaceous of Uzbekistan and Mongolia, with a review of the Nanhsiungchelyid record in Asia", Proceedings of the Zoological Institute RAS, 312: 3–25, doi:10.31610/trudyzin/2008.312.1-2.3 Mikhailov, K.; Sabath, K.; Kurzanov, S. (1994), Eggs and nests from the Cretaceous of Mongolia. In K. Carpenter, K. F. Hirsch, and J. R. Horner (eds.), Dinosaur Eggs and Babies, Cambridge University Press, Cambridge, pp. 88–115 Sochava, A. V (1969), "Dinosaur eggs from the Upper Cretaceous of the Gobi Desert", Paleontological Journal, 1969: 517–527 This article incorporates text by Congyu Yu, Albert Prieto-Marquez, Tsogtbaatar Chinzorig, Zorigt Badamkhatan & Mark Norell available under the CC BY 4.0 license.

Worked examples

Example 1 — a first encounter with Ulaanoosh Formation

Start with the simplest possible case. Write down what Ulaanoosh Formation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In earth science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Ulaanoosh Formation before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Ulaanoosh Formation ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Ulaanoosh Formation

In research: Ulaanoosh Formation appears in earth science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Ulaanoosh Formation in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Ulaanoosh Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Albian Stage, Alluvial deposits, Cenomanian Stage, so understanding it makes those chapters shorter.
In everyday life: Look for Ulaanoosh Formation outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Ulaanoosh Formation in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Ulaanoosh Formation means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Ulaanoosh Formation out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Ulaanoosh Formation in simple terms?

Why does Ulaanoosh Formation matter?

Because it connects several earth science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Ulaanoosh Formation?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Ulaanoosh Formation.