earth science

Lutetian limestone

Lutetian limestone 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 Lutetian limestone rather than just read about it. In short: Lutetian limestone (in French, calcaire lutécien, and formerly calcaire grossier) — also known as “Paris stone” — is a variety of limestone particular to the Eocene-aged deposits in the Paris Basin of France, most notably underlying the city of Paris. It has been a source of wealth as an economic and versatile building material since ancient Roman times (see Mines of Paris) and has contributed markedly to the unique…

Key takeaways

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

Reference excerpt

Lutetian limestone (in French, calcaire lutécien, and formerly calcaire grossier) — also known as “Paris stone” — is a variety of limestone particular to the Eocene-aged deposits in the Paris Basin of France, most notably underlying the city of Paris. It has been a source of wealth as an economic and versatile building material since ancient Roman times (see Mines of Paris) and has contributed markedly to the unique visual appeal of the “City of Light”. It has been hailed as “the warm, elusive, cream-grey stone of the French capital”. In addition to Paris, the Lutetian limestone also extends north and eastwards through France, and has also been mined in areas such as Rheims, Laon and Soissons. Its formation dates to the Eocene epoch's Lutetian age, between 48.07 and 41.03 Ma. The name "Lutetian" derives from Lutetia (French, Lutèce) which was the name of Paris in ancient times. The Lutetian age was named after the limestone of this region. The limestone consists of two different ages and depositional environments: a marine limestone deposited during the middle Lutetian (the iconic calcaire grossier) and a slightly younger freshwater limestone (alongside marl) deposited on top of the marine limestones during the later Lutetian, when the seas had receded.

History Between the 17th and 19th centuries, Lutetian limestone was extracted by tunneling through hill-sides south of Paris. The stone comprises many of the grandest Paris buildings from the 17th century onwards, including parts of the Louvre, the Place de la Concorde, Les Invalides and the Arc de Triomphe Haussmann's grand renovation of Paris (1853–1870), which provided a sweeping and uniform style and an elusive coloring — ranging from bright white to butter-yellow to a dull nicotine-yellow/grey — for Paris, relied upon buildings faced with Lutetian limestone. In the 20th century, open-cast quarries were developed north of Paris, which uncovered thinner layers of harder limestone closer to the surface. A now fashionable variety of Lutetian limestone from about 25 miles north of Paris is known as “Oise stone” or "Saint-Maximin limestone" and has become popular internationally for upscale building projects. In 2007, the quarries in southern Oise, around Saint-Maximin and Chantilly, applied to the French government to become the first to be granted a building stone Appellation Contrôlée – the badge of official French regional excellence – similar to the provenance system for wine or a cheese. According to a 2007 article in the UK's The Independent: “The harder, sliceable limestone sells for around €2,000 a cubic metre. The different grades of softer building stone sell for between €550 and €150 a cubic metre, which is very competitive with other building stone all around the world.”

Illustrations

Worked examples

Example 1 — a first encounter with Lutetian limestone

Start with the simplest possible case. Write down what Lutetian limestone 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 Lutetian limestone 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 Lutetian limestone 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 Lutetian limestone

In research: Lutetian limestone 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 Lutetian limestone 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: Lutetian limestone is common in secondary-school and first-year university syllabi. It links to neighbouring topics Building stone, Eocene France, Geography of Paris, so understanding it makes those chapters shorter.
In everyday life: Look for Lutetian limestone 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 Lutetian limestone in 20 minutes

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

Frequently asked questions

What is Lutetian limestone in simple terms?

Why does Lutetian limestone 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 Lutetian limestone?

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 Lutetian limestone.