earth science

Quebrada del Barro Formation

Quebrada del Barro 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 Quebrada del Barro Formation rather than just read about it. In short: The Quebrada del Barro Formation is a geological formation of the Marayes-El Carrizal Basin in San Juan Province, Argentina. This formation is the most fossiliferous portion of the Triassic Marayes Group, and is also the youngest unit of the group, overlying the El Carrizal Formation.

Key takeaways

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

Reference excerpt

The Quebrada del Barro Formation is a geological formation of the Marayes-El Carrizal Basin in San Juan Province, Argentina. This formation is the most fossiliferous portion of the Triassic Marayes Group, and is also the youngest unit of the group, overlying the El Carrizal Formation. An unconformity at the top of the Quebrada del Barro Formation separates it from the Cretaceous-age Los Riscos Formation of the El Gigante Group. Part of the formation may be made into a provincial park following the discovery of the fossils of Ingentia, a giant sauropodomorph dinosaur which helped elucidate the early evolution of sauropods.

Sedimentology The Quebrada del Barro Formation formed within a rift basin during a period of renewed fracturing. It encompasses 600 to 1,400 metres (2,000 to 4,600 ft) of red sandstones, fine conglomerates, and diamictites. Early hypotheses on the depositional environment proposed that the sediments formed in an alluvial fan or braided river system, while a newer proposal outlines how four different facies within the formation can be used to reconstruct a meandering semiarid floodplain deposited by mudflows and discharging in heterolithic terminal splays.

Fossil content The fauna of Quebrada del Barro is similar to that of the neighboring Los Colorados Formation which is considered to be from the Norian stage of the Late Triassic. Both formations preserve fossils from groups such as sauropodomorph dinosaurs, cynodonts, and testudinatans. However, Quebrada del Barro is more abundant in sphenodontians (Sphenotitan), tritheledontid cynodonts, and coelophysoid dinosaurs (Lucianovenator), while sauropodomorphs are somewhat less common and aetosaurs are completely absent, in contrast to the Los Colorados Formation. Sphenodontians and cynodonts are also abundant in microfossil assemblages. In addition, the Quebrada del Barro Formation preserves some of the only pterosaur and Dromomeron specimens known from Triassic strata in Argentina. Although the sphenodontian and cynodont-dominated fauna of Quebrada del Barro is akin to that of the Faxinal del Sotorno assemblage of the Brazilian Caturrita Formation, the fauna of the Faxinal del Sotorno assemblage is otherwise indicative of an older part of the Triassic than the Quebrada del Barro Formation.

Dinosaurs

Other avemetatarsalians

Pseudosuchians

Rhynchocephalians

Other reptiles

Synapsids

References

Bibliography Gardini, Carlos; Rivarola, David; Agüera, Maximiliano; Candela, Gerónimo (2009). "Estructura de la región Sierra de Guayaguas-Marayes, Provincias de San Juan y San Luis" (PDF). Revista de la Asociación Geológica Argentina. 65: 551–565. Retrieved 2018-09-08.

Illustrations

Worked examples

Example 1 — a first encounter with Quebrada del Barro Formation

Start with the simplest possible case. Write down what Quebrada del Barro 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 Quebrada del Barro 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 Quebrada del Barro 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 Quebrada del Barro Formation

In research: Quebrada del Barro 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 Quebrada del Barro 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: Quebrada del Barro Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Alluvial deposits, Fluvial deposits, Fossiliferous stratigraphic units of South America, so understanding it makes those chapters shorter.
In everyday life: Look for Quebrada del Barro 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 Quebrada del Barro Formation in 20 minutes

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

Frequently asked questions

What is Quebrada del Barro Formation in simple terms?

Why does Quebrada del Barro 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 Quebrada del Barro 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 Quebrada del Barro Formation.