earth science

Guichón Formation

Guichón 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 Guichón Formation rather than just read about it. In short: The Guichón Formation is a Late Cretaceous geologic formation of the Paysandú Group in Uruguay. Dinosaur remains are among the fossils that have been recovered from the formation.

Key takeaways

Guichón 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 Guichón Formation to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Guichón Formation from memory before moving on to harder problems.

Reference excerpt

The Guichón Formation is a Late Cretaceous geologic formation of the Paysandú Group in Uruguay. Dinosaur remains are among the fossils that have been recovered from the formation.

Description The Guichón Formation comprises mainly pink-greyish to reddish sandstones, which contain moderate to well-sorted, subrounded, fine to medium-sized grains in a pelitic matrix. These sandstones (which compositionally are feldspathic wackes) are either massive or may instead exhibit parallel lamination, cross-lamination and graded bedding. These lithologies were deposited in southwest-trending alluvial–fluvial systems comprising low-sinuosity channels traversing through sandy plains. Subordinate to the already mentioned sandstones are conglomeratic and pelitic lithologies, interpreted as channel-fill and overbank deposits, respectively. It is inferred that the Guichón Formation was deposited in warm, semi-arid climatic conditions. The formation has been correlated to the Puerto Yeruá Formation of northwestern Argentina. The formation reaches a thickness of more than 100 metres (330 ft) in wells perforating the formation. It is overlain by the Mercedes Formation and overlies the Arapey Formation.

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

Dinosaurs

Ornithischians

Sauropods

Theropods

Crocodylomorphs

Oofossils

See also List of dinosaur-bearing rock formations List of stratigraphic units with indeterminate dinosaur fossils List of fossiliferous stratigraphic units in Uruguay

References

Bibliography Soto, M.; Perea, D.; Cambiaso, A. (2012), "First sauropod (Dinosauria: Saurischia) remains from the Guichón Formation, Late Cretaceous of Uruguay", Journal of South American Earth Sciences, 33: 68–79, doi:10.1016/j.jsames.2011.08.003 Soto, M.; Perea, D. (2011), "A new specimen of Uruguaysuchus aznarezi (Crocodyliformes: Notosuchia) from the middle Cretaceous of Uruguay and its phylogenetic relationships", Zoological Journal of the Linnean Society, 163: S173–S198, doi:10.1111/j.1096-3642.2011.00717.x, hdl:11336/69086 Tófalo, Ofelia; Pazos, Pablo J.; Sánchez Bettucci, Leda (2011), "Estudio composicional de sedimentitas silicoclásticas y paleosuelos de la Formación Mercedes (Cretácico Superior), Uruguay", Revista de la Asociación Geológica Argentina, 68: 615–626, retrieved 2020-08-23 Soto, M.; Perea, D.; Veroslavsky, G.; Rinderknecht, A.; Ubilla, M.; Lecuona, G. (2009), "Nuevos hallazgos de restos de dinosaurios y consideraciones sobre la edad de la Formación Guichón - New findings of dinosaur remains and considerations on the age of the Guichón Formation" (PDF), Revista Sociedad Uruguaya de Geología, 15: 11–23, retrieved 2018-09-07 Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21{{citation}}: CS1 maint: publisher location (link) Mones, A (1972), "Lista de los vertebrados fósiles del Uruguay, I. Chondrichthyes, Osteichthyes, Reptilia, Aves - List of the fossil vertebrates of Uruguay, I. Chondrichthyes, Osteichthyes, Reptilia, Aves", Comunicaciones Paleontologicas del Museo de Historia Natural de Montevideo, 1: 23–35 von Huene, F (1934), "Neue Saurier-Zähne aus der Kreide von Uruguay - New saurian teeth from the Cretaceous of Uruguay", Centralblatt für Mineralogie, Geologie und Paläontologie, Abteilung B, 1934: 183–189

Illustrations

Worked examples

Example 1 — a first encounter with Guichón Formation

Start with the simplest possible case. Write down what Guichón 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 Guichón 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 Guichón 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 Guichón Formation

In research: Guichón 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 Guichón 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: Guichón Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Albian Stage, Aptian Stage, Cenomanian Stage, so understanding it makes those chapters shorter.
In everyday life: Look for Guichón 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 Guichón Formation in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Guichón 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 Guichón Formation out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Guichón Formation in simple terms?

The Guichón Formation is a Late Cretaceous geologic formation of the Paysandú Group in Uruguay. Dinosaur remains are among the fossils that have been recovered from the formation.

Why does Guichón 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 Guichón 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 Guichón Formation.