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Percé Rock

Percé Rock 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 Percé Rock rather than just read about it. In short: Percé Rock (French: Rocher Percé, pronounced [ʁɔʃe pɛʁse], lit. 'Pierced Rock') is a huge sheer rock formation in the Gulf of Saint Lawrence on the tip of the Gaspé Peninsula in Quebec, Canada, off Percé Bay. Percé Rock appears from a distance like a ship under sail.

Percé Rock — main illustration
Percé Rock — illustration

Key takeaways

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

Reference excerpt

Percé Rock (French: Rocher Percé, pronounced [ʁɔʃe pɛʁse], lit. 'Pierced Rock') is a huge sheer rock formation in the Gulf of Saint Lawrence on the tip of the Gaspé Peninsula in Quebec, Canada, off Percé Bay. Percé Rock appears from a distance like a ship under sail. It is one of the world's largest natural arches located in water and is considered a geologically and historically rich natural icon of Quebec. It is a major attraction in the Gaspésie region.

Etymology The massive rocky cliff is called by several names, such as le Rocher Percé, Pierced Rock, Pierced Island, Split Rock or Percé Rock. The name is attributed to the pierced rock that forms an arch 15 metres (49 ft) high on its seaward southern end, as though a needle had cut through the rock. It was named Percé ("pierced rock") by Samuel de Champlain in 1607, in reference to the holes he had seen in the massive block of limestone, which over the years has become a major attraction in the province of Quebec.

Legend The Percé Rock, described as "the monstrous giant; pierced through by an immense eye, now green, now gray, now blue or violet, according to the moods of the sea", is linked in legend to a young man of a noble French family. Another version of the legend, which is also narrated by the local people of Percé town, is that they see the rock in the shape of a "phantom" during storms and hence call it "Le Génie de l'Isle Percée". This, however, could be interpreted to mean that the vapoury clouds that engulf the "vast flocks of water fowl" could give such an impression when viewed from a distance.

Geography

Percé Rock is part of the range of cliffs, bays and hills on the southwest side of the Gulf of Saint Lawrence, which are formed of reddish-gold limestone and shale. It is linked to mainland (at Rue du Mont Joli) by a sandbar at low tide. The Bay of Perce is situated between this rock and the High Head. There is a reef to the southwest of Percé Rock, about 0.5 miles (800 m) away from the shore. The town of Percé is located on the shores of the bay. Its main industry is fishing. Percé reef is about 0.5 miles (800 m) from the centre of the town where small vessels can be moored. Midway across the rock is a shoal that stretches over a length of 0.25 miles (400 m). The rock formation has about 150 fossil species. In Bonaventure Island where the park is situated, conglomerates from the Carboniferous period of more than 310 million years are recorded. Next to the rock is Bonaventure Island, and together they form Parc national de l'Île-Bonaventure-et-du-Rocher-Percé (Bonaventure Island and Percé Rock National Park), founded in 1985, which covers an area of about 5.8 square kilometres (2.2 sq mi). The tip of the Gaspé Peninsula has five geological formations, and Percé Rock is the only one located within the park. The park extends over a 2 kilometres (1.2 mi) stretch of the coastline, and exhibits a wide variety of flora and fauna. It is a migratory bird sanctuary for the northern gannet, and has over 110,000 nesting birds, the second largest in the world. (The Municipal website of Percé mentions that the population of northern gannets is 121,000, which exceeds the figures mentioned for the archipelago of St Kilda in Scotland.) Other birds found on the island include puffins, razorbills, black guillemot and kittiwakes, as well as over 200 other species. From May to December, some species of blue whale, humpback whale, minke whale or fin whale can be seen along the coast near Percé, Bonaventure Island and Forillon National Park. At low tide, the rock is approachable on foot. The rock and the bird colony in Bonaventure Island is about a 75-minute trip from Percé by boat. Visits to the rock are restricted to the period from May 28 to October 12. During such visits, park guides provide information on beach creatures, the geology of Percé Rock, also called the "cathedral of limestone that rose from the Equator", and the fossils found there. The rock mass is a monolith estimated at 5 million tonnes. It has been inferred that at the current erosion rate (about 300 tonnes of mass per year lost to the action of water and wind), it will disappear in about 16,000 years. In view of its tendency to collapse, it is dangerous to venture close to the rock on foot during low tide. The top of the rock is not accessible because of its height. Snowy gannets, silvery gulls, black cormorants and other species of birds perch there. An interpretation centre in Percé, housed in Le Chafaud, an elegant restored building, has a thematic exhibition titled "Un rocher, une île, un parc national", meaning "one rock, one island, one national park", which recounts the bird life, marine life, geology, history and ecosystem of the park and the rock.

Description

Percé Rock is a massive siliceous limestone stack formation, with sandstone and siltstone veins, with steep rock faces on all sides. It is 433 metres (1,421 ft) long, 90 metres (300 ft) wide, and 88 metres (289 ft) high at its highest point. It is described as a narrow bluff emerging out of the sea, "resembling a beached supertanker from some angles". For four hours at a time during low tide, the water recedes from a wide spit that allows the rock itself to be visited.

History

… excerpt ends here. Continue reading the full article.

Illustrations

Percé Rock illustration
Percé Rock: Northern gannets on Bonaventure Island and also seen on Percé Rock
Northern gannets on Bonaventure Island and also seen on Percé Rock
Percé Rock illustration
Percé Rock illustration
Percé Rock: Print title: "A view of the Pierced Island, a remarkable rock in the Gulf of St. Laurence—two leagues to the southward of Gaspée Bay" drawn by Captain Hervey Smyth, 1760; engraved by Pierre Charles Cannot 1768. Note there are two arches
Print title: "A view of the Pierced Island, a remarkable rock in the Gulf of St. Laurence—two leagues to the southward of Gaspée Bay" drawn by Captain Hervey Smyth, 1760; engraved by Pierre Charles Cannot 1768. Note there are two arches

Worked examples

Example 1 — a first encounter with Percé Rock

Start with the simplest possible case. Write down what Percé Rock 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 Percé Rock 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 Percé Rock 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 Percé Rock

In research
Percé Rock 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 Percé Rock 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
Percé Rock is common in secondary-school and first-year university syllabi. It links to neighbouring topics Coastal islands of Quebec, Gaspé Peninsula, Landforms of Gaspésie–Îles-de-la-Madeleine, so understanding it makes those chapters shorter.
In everyday life
Look for Percé Rock 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 Percé Rock in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Percé Rock means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Percé Rock out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Percé Rock in simple terms?

Percé Rock (French: Rocher Percé, pronounced [ʁɔʃe pɛʁse], lit. 'Pierced Rock') is a huge sheer rock formation in the Gulf of Saint Lawrence on the tip of the Gaspé Peninsula in Quebec, Canada, off Percé Bay. Percé Rock appears from a distance like a ship under sail.

Why does Percé Rock 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 Percé Rock?

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 Percé Rock.

Tags

  • Coastal islands of Quebec
  • Gaspé Peninsula
  • Landforms of Gaspésie–Îles-de-la-Madeleine
  • Natural arches
  • Rock formations of Canada
  • Stacks of Canada
  • Tourist attractions in Gaspésie–Îles-de-la-Madeleine

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