earth science

Guettioua Formation

Guettioua 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 Guettioua Formation rather than just read about it. In short: The Guettioua Formation or Formation des Grès des Guettioua is a geological formation in Morocco. It dates to the Bathonian stage of the Middle Jurassic.

Key takeaways

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

Reference excerpt

The Guettioua Formation or Formation des Grès des Guettioua is a geological formation in Morocco. It dates to the Bathonian stage of the Middle Jurassic. It largely consists of continental red sandstone and is the lateral equivalent of the marine El Mers Formation. It´s synonyms include Grès de Wansero, Grès des Guettioua or Infracénomanien/Jurassique continental.

History The formation was introduced by E. Roch in 1933 for the red beds in the Guettioua basin overlying Bajocian limestones. Its age was long debated, initially considered "Dogger", later assigned to the Cretaceous by some authors due to apparent basal unconformities. Jenny, Le Marrec & Monbaron (1981) restricted the name to the red sandstones above Bajocian limestones and below the Iouaridène Formation, confirming a Bathonian age through dinosaur correlations, palynology of the overlying unit, revised radiometric dating of associated volcanics, and lateral facies comparisons with the El Mers and Anemzi formations.

Description The Guettioua Formation is composed almost exclusively of reddish detrital sediments ranging from conglomerates to silts, varied quartz content, all brick-red, although gray-yellow conglomeratic channels occur, often containing plant debris, bone fragments, and occasionally azurite and malachite. The sandstones are feldspathic, with rounded quartz grains, feldspars (labradorite, bytownite), micas, volcanic rock fragments (rhyolites), and hematite. The formation records the Atlas first basaltic event (locally B1), formed by numerous lava flows that flowed towards the north and northwest of the basins. Due to the lenticular and channelized nature of the unit, no single type section is representative. The base may show a progressive transition with the underlying Tanant 3 Formation or a progressive syntectonic unconformity, resting on various older units down to the Imi-n-Ifri Formation in places. Upper boundary passes gradually upward into the red pelites of the Iouaridène Formation, known for abundant dinosaur trackways.

Sedimentology The formation represents predominantly continental, deltaic to palustrine (marsh/lacustrine margin) environments. Diagnostic features include conglomeratic channels, raindrop impressions, ferric oxide staining, cross-stratification, lenticular bedding, abundant plant trunks, and terrestrial vertebrates. Synsedimentary tectonics caused significant thickness variations, basin tilting, and intraformational unconformities. Associated magmatic activity includes basaltic flows, dykes, and gabbroic intrusions in some areas (especially Aït-Attab and Aït-Toutline). Thickness varies significantly (from 10–20 m in the Ait Ourir area to 500–600 m in the Msemrir syncline) due to syn-depositional tectonics and differential subsidence. The formation is widely exposed in the axial zone and northern front of the Central High Atlas, with occurrences also along the southern margin. Fluvial paleocurrent data indicate a dominant sediment transport toward the north-east and east. The western part of the Central High Atlas (Marrakesh High Atlas sector) acted as a topographic high supplying clastic material, while major depocenters and distributive fluvial fans developed eastward. This pattern reflects an early relief differentiation within the Atlas domain during the Bathonian. The formation extends with relatively consistent facies to the Ait Ourir region. West of Demnate, distinction from underlying red units is difficult. Thickness varies strongly due to tectonic activity. Eastward, marls and pelites intercalate, producing variegated ("Neapolitan slice") facies. It is also recognised on the southern flank of the High Atlas.

Biota

Invertebrates

Amniotes

Plants

See also List of dinosaur-bearing rock formations Anoual Formation El Mers Formation Iouaridène Formation

References

Illustrations

Worked examples

Example 1 — a first encounter with Guettioua Formation

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

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

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

Frequently asked questions

What is Guettioua Formation in simple terms?

The Guettioua Formation or Formation des Grès des Guettioua is a geological formation in Morocco. It dates to the Bathonian stage of the Middle Jurassic.

Why does Guettioua 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 Guettioua 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 Guettioua Formation.