earth science

Jaisalmer Formation

Jaisalmer 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 Jaisalmer Formation rather than just read about it. In short: The Jaisalmer Formation is a Middle to Late Jurassic-aged geologic formation located in India near the city of Jaisalmer that consists mainly of marine deposits. The formation was first identified and defined by geologist Richard Dixon Oldham in 1886.

Key takeaways

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

Reference excerpt

The Jaisalmer Formation is a Middle to Late Jurassic-aged geologic formation located in India near the city of Jaisalmer that consists mainly of marine deposits. The formation was first identified and defined by geologist Richard Dixon Oldham in 1886. Dinosaur remains are among the known fossils recovered from this formation. Strophodus jaisalmerensis, a hybodont, was named after this formation and the Jaisalmer District where its holotype was found.

Sub-units The Badabag, Fort, Joyan and Hamira members represent the Middle Jurassic Bajocian and Bathonian stages, while the Jajiya and Kuldhar members represent the Middle Jurassic Callovian and the Late Jurassic Oxfordian stages. The Fort Member is the most extensively studied and consists of fine to medium grain sandstones and oolitic limestones. The Badabag Member consists of intraformational conglomerate and is fossil bearing.

Paleoenvironment The Jaisalmer district of India is a landlocked district in the state of Rajasthan. However, during the Middle Jurassic, the Jaisalmer Formation was located on the Tethyan coast of Gondwanan India. A marine paleoenvironment is supported by the presence of Hybodont sharks. The Kuldhar Member Limestone contained carbonate microfacies that also indicate a depositional environment composed mainly of lagoons, shoals and open marine environments.

Paleofauna

Dinosaurs

Sauropods

Theropods

Other reptiles

Fish

Crustaceans

Ichnofossils ?Bichordites sp. – Ichnofossils Planolites sp. – Ichnofossils Rhizocorallium irregulare – Ichnofossils Rhizocorallium jenense – Ichnofossils Taenidium serpentinum – Ichnofossils Thalassinoides sp. – Ichnofossils

References

Illustrations

Worked examples

Example 1 — a first encounter with Jaisalmer Formation

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

In research: Jaisalmer 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 Jaisalmer 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: Jaisalmer Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Bajocian Stage, Bathonian Stage, Callovian Stage, so understanding it makes those chapters shorter.
In everyday life: Look for Jaisalmer 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 Jaisalmer Formation in 20 minutes

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

Frequently asked questions

What is Jaisalmer Formation in simple terms?

Why does Jaisalmer 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 Jaisalmer 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 Jaisalmer Formation.