earth science

Tarjados Formation

Tarjados 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 Tarjados Formation rather than just read about it. In short: The Tarjados Formation is an Early to Middle Triassic geologic formation in the Ischigualasto-Villa Unión Basin of La Rioja Province in northwestern Argentina. The red to whitish sandstones and conglomerates of the formation were deposited in an arid fluvial environment.

Key takeaways

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

Reference excerpt

The Tarjados Formation is an Early to Middle Triassic geologic formation in the Ischigualasto-Villa Unión Basin of La Rioja Province in northwestern Argentina. The red to whitish sandstones and conglomerates of the formation were deposited in an arid fluvial environment. The formation overlies the Talampaya Formation and is overlain by the Chañares Formation of the Agua de la Peña Group. The formation has provided fossils of an archosaur and a kannemeyeriid dicynodont, both not yet placed in a dedicated genus. The formation crops out in the Talampaya National Park, which was designated a UNESCO World Heritage Site in 2000.

Description The formation was first defined by Romer and Jensen in 1966, based on a type section exposed in the Sierra de Los Tarjados. The Tarjados Formation, as the underlying Talampaya Formation, belongs to the Paganzo Group. The formation is exposed in the Talampaya National Park of La Rioja Province. The Tarjados Formation is overlain by the Chañares Formation, separated by a regional unconformity. The formation, reaching a maximum thickness of 250 metres (820 ft), comprises red to greenish grey sandstones, deposited in an eolian and playa-lacustrine to fluvial environment. The sediments were deposited under arid, or semi-arid conditions. The formation has provided fossils of an archosaur and a kannemeyeriid dicynodont, both not yet placed in a dedicated genus.

See also Santa Maria Formation, contemporaneous fossiliferous formation of the Paraná Basin in southeastern Brazil Katberg Formation, contemporaneous fossiliferous formation of the Karoo Basin in South Africa Fremouw Formation, contemporaneous fossiliferous formation of Antarctica

References

Bibliography Aceituno Cieri, P.; Zeballos, M.E.; Rocca, R.J.; Martino, R.D.; Carignano, C.; Guereschi, A.; Giambastiani, M. (2015), "Condicionantes geológicos en el cruce de la sierra de Valle Fértil. San Juan - Geological constraints at the crossing of sierra Valle Fertil. San Juan", Revista de Geología Aplicada a la Ingeniería y al Ambiente, 35: 57–69 Balabusic, Ana M. (2001), Plan de Manejo del Parque Nacional Talampaya (PDF), Administración de Parques Nacionales, pp. 1–68, retrieved 2019-03-28 Caselli, Alberto Tomás (1998), Estratigrafía y sedimentología de las formaciones Patquía (Pérmico) y Talampaya (Triásico Inferior), en las Sierras Pampeanas Noroccidentales y Precordillera Central (Provincias de La Rioja y San Juan) (PhD thesis) (PDF), Universidad de Buenos Aires, pp. 1–437, retrieved 2019-03-28 Ezcurra, Martín D.; Martinelli, Agustín G.; Fiorelli, Lucas E.; Da Rosa, Attila A.S.; Desojo, Julia B. (2015), "Archosauromorph remains from the Tarjados Formation (Early-Middle Triassic, NW Argentina)", Ameghiniana, 52 (5): 475–486, doi:10.5710/AMGH.12.05.2015.2907, hdl:11336/12108, retrieved 2019-03-28 Monetta, A.; Baraldo, J.; Cardinali, A.; Weidmann, R.; Lanzilotti, M. (2000), Distribución y características del magmatismo intratriasico de Ischigualasto, San Juan, Argentina (PDF), IX Congreso Geológico Chileno, pp. 644–648, archived from the original (PDF) on 2019-03-28, retrieved 2019-03-28

Further reading Bonaparte, J.F (1978), "El Mesozóico de América de Sur y sus Tetrapodos - The Mesozoic of South America and its tetrapods", Opera Lilloana, 26: 1–596

Illustrations

Worked examples

Example 1 — a first encounter with Tarjados Formation

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

In research: Tarjados 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 Tarjados 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: Tarjados Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Aeolian deposits, Anisian Stage, Conglomerate formations of Argentina, so understanding it makes those chapters shorter.
In everyday life: Look for Tarjados 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 Tarjados Formation in 20 minutes

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

Frequently asked questions

What is Tarjados Formation in simple terms?

Why does Tarjados 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 Tarjados 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 Tarjados Formation.