science

Sangkarewang Formation

Sangkarewang Formation is a 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 Sangkarewang Formation rather than just read about it. In short: The Sankarewang Formation is an ?Early or Middle Eocene-aged geological formation in Sumatra, Indonesia near Padang. It is among the very few Paleogene fossil deposits from Southeast Asia that preserves a freshwater ecosystem, and contains many of the earliest records of freshwater fish taxa that now predominate the region.

Key takeaways

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

Reference excerpt

The Sankarewang Formation is an ?Early or Middle Eocene-aged geological formation in Sumatra, Indonesia near Padang. It is among the very few Paleogene fossil deposits from Southeast Asia that preserves a freshwater ecosystem, and contains many of the earliest records of freshwater fish taxa that now predominate the region. Many of the fishes from this formation are well-preserved as articulated skeletons. The fossils of the formation have been known since the 1870s, although they only received significant attention during the 1930s and again starting from the mid-2010s. The age for this formation has long been disputed, with suggested ages ranging from the Cretaceous to the Miocene. Although the exact age still remains uncertain, most recent studies have settled on a tentative Paleogene age, with estimates ranging from the Paleocene to the Oligocene. More recently, palynological data suggests that the overlying Sawahlunto Formation is of middle-late Eocene in age, which would most likely place the Sangkarewang Formation in the early-mid Eocene. It was deposited within the Ombilin Basin, a small Paleogene-aged rift basin that formed from deformation along the Great Sumatran fault. The Sangkarewang Formation was deposited within a freshwater rift lake that formed in this basin early on, with anoxic bottom waters allowing for the fossilization of the fish skeletons. The Sawahlunto Formation, long exploited for its coal seams, was later deposited in the lake on top of the Sangkarewang Formation. During the Oligocene, this gave way to a river delta (the Sawahtambang Formation), and was later flooded by the sea by the Miocene (the Ombilin Formation), before a tectonic uplift raised it above the sea. The formation has been explored for its oil shales.

Paleobiota

Bony fish Partially based on Woodward (1901) & Sanders (1934). Sanders (1934) published a comprehensive monograph about the fishes of the formation using a large number of specimens. However, the vast majority of these specimens are now lost, and may have potentially been destroyed during World War II, preventing any further study of her specimens.

Birds

References

Illustrations

Worked examples

Example 1 — a first encounter with Sangkarewang Formation

Start with the simplest possible case. Write down what Sangkarewang Formation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In 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 Sangkarewang 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 Sangkarewang 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 Sangkarewang Formation

In research: Sangkarewang Formation appears in 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 Sangkarewang 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: Sangkarewang Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Eocene Asia, Eocene Series, Oil shale formations, so understanding it makes those chapters shorter.
In everyday life: Look for Sangkarewang 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 Sangkarewang Formation in 20 minutes

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

Frequently asked questions

What is Sangkarewang Formation in simple terms?

Why does Sangkarewang Formation matter?

Because it connects several 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 Sangkarewang 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 Sangkarewang Formation.