earth science

Rajmahal hills

Rajmahal hills 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 Rajmahal hills rather than just read about it. In short: The Rajmahal Hills are located in the Santhal Pargana division of Jharkhand, India, and form part of the Rajmahal Traps, which were created by extensive volcanic activity during the Jurassic period. The Intertrappean Beds of the Rajmahal Formation contain a significant assemblage of plant fossils and have been designated a National Geological Monument by the Geological Survey of India.

Key takeaways

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

Reference excerpt

The Rajmahal Hills are located in the Santhal Pargana division of Jharkhand, India, and form part of the Rajmahal Traps, which were created by extensive volcanic activity during the Jurassic period. The Intertrappean Beds of the Rajmahal Formation contain a significant assemblage of plant fossils and have been designated a National Geological Monument by the Geological Survey of India.

Geography The Rajmahal Hills span over 2,600 km2 (1,000 sq mi) across the Santhal Pargana division of northeastern Jharkhand. The hills forms an arc extending from northeast to southwest, approximately 190 km (120 mi) south of the Ganges, between Rajmahal and Dumka. Their elevation reaches a maximum of 567 m (1,860 ft), with an average elevation of 134 m (440 ft). The hills are inhabited by the Sauria Paharia people while the surrounding valleys are predominantly populated by the Santhal people.

Geology The Rajmahal Traps constitute a volcanic igneous province formed by multiple layers of solidified lava. The traps developed along the eastern continental margin of India following the rifting of Gondwanaland. Subsequent deformation of the upper lava sequence produced graben structures. The traps are predominantly composed of tholeiitic basalt, quartz and olivine tholeiites, and alkali basalt. Between the lava flows are the Intertrappean Beds, which consist mainly of sedimentary rocks such as siltstone, claystone, and shale. The Rajmahal Hills form the type area of the Rajmahal Group, a sequence of volcanic rocks associated with Jurassic volcanic activity in the region north of the Ganges delta.

Fossils The Intertrappean Beds of the Rajmahal Hills area contain a significant assemblage of plant fossils dating to the Cretaceous period (about 145 to 68 Ma). The fossil-bearing site has been designated a National Geological Monument by the Geological Survey of India. Some of the fossils are preserved at the Birbal Sahni Institute of Palaeobotany in Lucknow. However, the fossil deposits face potential threats from mining activities, following the state government's grant of mining leases in the area to private companies in 2018.

References

Illustrations

Worked examples

Example 1 — a first encounter with Rajmahal hills

Start with the simplest possible case. Write down what Rajmahal hills 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 Rajmahal hills 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 Rajmahal hills 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 Rajmahal hills

In research: Rajmahal hills 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 Rajmahal hills 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: Rajmahal hills is common in secondary-school and first-year university syllabi. It links to neighbouring topics Hills of Jharkhand, National Geological Monuments in India, so understanding it makes those chapters shorter.
In everyday life: Look for Rajmahal hills 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 Rajmahal hills in 20 minutes

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

Frequently asked questions

What is Rajmahal hills in simple terms?

Why does Rajmahal hills 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 Rajmahal hills?

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 Rajmahal hills.