biology

Quercy Phosphorites Formation

Quercy Phosphorites Formation is a biology 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 Quercy Phosphorites Formation rather than just read about it. In short: The Quercy Phosphorites Formation (French: Phosphorites du Quercy; Occitan: Fosforits de Quercy) is a geologic formation and lagerstätte in Occitanie, southern France. It preserves fossils dated to the Paleogene period (latest Bartonian to Late Oligocene), or MP16 to MP28 zones of the European land mammal age classification, ranging from approximately 38 to 25 Ma.

Key takeaways

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Reference excerpt

The Quercy Phosphorites Formation (French: Phosphorites du Quercy; Occitan: Fosforits de Quercy) is a geologic formation and lagerstätte in Occitanie, southern France. It preserves fossils dated to the Paleogene period (latest Bartonian to Late Oligocene), or MP16 to MP28 zones of the European land mammal age classification, ranging from approximately 38 to 25 Ma. It qualifies as a Lagerstätte because beside a large variety of mammals, birds, turtles, crocodiles, flora and insects, it also preserves the soft tissues of amphibians and squamates, in addition to their articulated skeleton in what has been called natural mummies. The genera Quercylurus, Quercymegapodius, Quercypsitta, Quercypodargus, Quercycerta and Quercygama, and species Mosaicomeryx quercyi, Robiacina quercyi, Palaeophyllophora quercyi, Archaeomys quercyi, Eomys quercyi, Eucricetodon quercyi and Tarnomys quercynus, as well as the lizards Paraplacosauriops quercyi and Pseudolacerta quercyini and the insect Palaeortona quercyensis were named after the formation.

Description The first phosphate deposits in Quercy were discovered in 1869 and published by Daubré and Trutat independently in 1871. The first fossils from the formation were described by Delfortie (1872) and Gervais in the same year and extensively studied by Filhol from 1877 onwards. The first geologic investigation of the formation was performed by Thévenin in 1903, and apart from a description by Gèze in 1938, the paleontological richness was not studied until a team of researchers of the Universities of Montpellier and Paris visited the site in 1965. The karstified phosphate deposits are found from the Lot and Célé river valleys in the north to the left bank of the Aveyron in the south and from the Villefranche Fault in the east to the lacustrine deposits of the Aquitaine Basin in the west. The formation is found in fissures (karst) incising Jurassic and Triassic rocks east of Cahors. The age of the fossiliferous unit, in which almost 12,000 specimens were found ranges from the MP16 to MP28 zones of the European land mammal age classification. These ages correspond to the latest Bartonian to Chattian, from about 38 to 25 Ma.

Paleontological significance

The Quercy Phosphorites Formation is a highly fossiliferous unit designated as a Lagerstätte due to the excellent preservation of fossils. The phosphorite conserves up to the nerves, digestive tract and stomach content, insect larvae and other elements of the paleobiology in the formation. Nearly all Quercy fly pupae were preserved as isolated endocasts, of which many were still covered by the puparium, the hardened skin of the last larval instar. The formation also straddles the Grande Coupure and shows diversity changes (number of species) of frog, salamander, lizard and snake fossil records across the formation. It is assumed that the Quercy arthropods fossilized by a rapid fixation by phosphate-rich water followed by encrustation and mineralization.

Paleofauna The following fossils have been reported from the formation:

Mammals

Apatemyidae

Artiodactyls

Carnivora

Chiroptera

Creodonta

Euarchonta

Hyaenodonta

Lipotyphla

Marsupials

Perissodactyls

Primates

Proeutheria

Rodents

Birds

Reptiles

Crocodilians

Lizards

Snakes

Turtles

Amphibians Frogs

Salamanders

Insects

Blattodea

Diptera

Coleoptera

Hymenoptera

Lepidoptera

Orthoptera

Myriapoda

Flora

References

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Illustrations

Worked examples

Example 1 — a first encounter with Quercy Phosphorites Formation

Start with the simplest possible case. Write down what Quercy Phosphorites Formation claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In biology, 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 Quercy Phosphorites 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 Quercy Phosphorites 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 Quercy Phosphorites Formation

In research: Quercy Phosphorites Formation appears in biology 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 Quercy Phosphorites 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: Quercy Phosphorites Formation is common in secondary-school and first-year university syllabi. It links to neighbouring topics Eocene Series of Europe, Geography of Occitania (administrative region), Geologic formations of France, so understanding it makes those chapters shorter.
In everyday life: Look for Quercy Phosphorites 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 Quercy Phosphorites Formation in 20 minutes

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Frequently asked questions

What is Quercy Phosphorites Formation in simple terms?

Why does Quercy Phosphorites Formation matter?

Because it connects several biology 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 Quercy Phosphorites 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 Quercy Phosphorites Formation.