earth science

Pisco Formation

Pisco 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 Pisco Formation rather than just read about it. In short: The Pisco Formation is a geologic formation located in Peru, on the southern coastal desert of Ica and Arequipa. The approximately 640 metres (2,100 ft) thick formation was deposited in the Pisco Basin, spanning an age from the Late Miocene up to the Early Pliocene, roughly from 9.6 to 4.5 Ma.

Key takeaways

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

Reference excerpt

The Pisco Formation is a geologic formation located in Peru, on the southern coastal desert of Ica and Arequipa. The approximately 640 metres (2,100 ft) thick formation was deposited in the Pisco Basin, spanning an age from the Late Miocene up to the Early Pliocene, roughly from 9.6 to 4.5 Ma. The tuffaceous sandstones, diatomaceous siltstones, conglomerates and dolomites were deposited in a lagoonal to near-shore environment, in bays similar to other Pacific South American formations as the Bahía Inglesa and Coquimbo Formations of Chile. The Pisco Formation is considered one of the most important Lagerstätten sites, based on the large amount of exceptionally preserved marine fossils, including sharks (most notably megalodon), birds including penguins, whales and dolphins, marine crocodiles, and Thalassocnus, a marine giant sloths. Other famous fossils from this site include the giant raptorial sperm whale Livyatan, the sperm whale relative Acrophyseter, and the walrus-like dolphin Odobenocetops.

Description The Pisco Formation of the Pisco Basin consists of tuffaceous sandstones, diatomaceous yellow to gray siltstones and a basal conglomerate. The formation is deposited from Pisco in the north to Yauca in the south. The northern portion is known as the Ocucaje Area and the southern part as the Sacaco Area. The total thickness of the formation is estimated at 640 metres (2,100 ft). The formation unconformably overlies the Chilcatay and Caballas Formations.

Paleobiota of the Pisco Formation The Pisco Formation has provided a rich resource of marine fauna, including marine mammals like cetaceans and seals, large fishes, reptiles, and penguins. It is also one of the richest sites in the world for fossil cetaceans, with close to 500 examples being found in the formation. The oldest fossils of the aquatic sloth Thalassocnus (T. antiquus) come from the Aguada de Lomas horizon of the Pisco Formation and were dated at roughly 7 Ma. The youngest specimen (T. carolomartini) was found in the Sacaco horizon and dated to approximately 3 Ma. Thalassocnus was preyed upon by the probable apex predators of the environment, Livyatan and megalodon. The youngest strata belonging to the formation have been dated at 2 Ma, corresponding to the Early Pleistocene (Uquian). Fossils of the modern Humboldt penguin were found in these deposits at the Yauca locality.

Mollusks

Bivalves

Polychaetes

Gastropods

Fish

Bony fish

Rays

Sharks

Reptiles

Crocodilians

Turtles

Birds

Mammals

Cetaceans

Pinnipeds Seals

Xenarthrans Sloths

Correlations

Laventan

See also Bahía Inglesa Formation, contemporaneous fossiliferous formation of Chile Castilletes Formation, contemporaneous fossiliferous formation of the Cocinetas Basin, Colombia Cerro Ballena, contemporaneous fossil site of the Bahía Inglesa Formation of Chile Coquimbo Formation, contemporaneous fossiliferous formation of Chile Collón Curá Formation, contemporaneous fossiliferous formation of Patagonia, Argentina Honda Group, contemporaneous fossiliferous formation of Colombia Navidad Formation, contemporaneous fossiliferous formation of Chile Pebas Formation, contemporaneous fossiliferous formation of the Amazon Basin Urumaco, contemporaneous fossil site of the Falcón Basin, Venezuela

References

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Pisco Formation

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

In research: Pisco 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 Pisco 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: Pisco Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Chapadmalalan, Chasicoan, Colloncuran, so understanding it makes those chapters shorter.
In everyday life: Look for Pisco 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.

Affiliate

Preply — study more efficiently by working with a personal tutor. 50% off.

How to study Pisco Formation in 20 minutes

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

Frequently asked questions

What is Pisco Formation in simple terms?

Why does Pisco 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 Pisco 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 Pisco Formation.