earth science

Paibian

Paibian 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 Paibian rather than just read about it. In short: The Paibian is the lowest stage of the Furongian Series of the Cambrian System. The Paibian is also the first age of the Furongian Epoch of the Cambrian Period.

Key takeaways

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

Reference excerpt

The Paibian is the lowest stage of the Furongian Series of the Cambrian System. The Paibian is also the first age of the Furongian Epoch of the Cambrian Period. It follows the Guzhangian (Miaolingian series of the Cambrian) and is succeeded by the Jiangshanian Stage. The base is defined as the first appearance of the trilobite Glyptagnostus reticulatus around 497 million years ago. The top, or the base of the Jiangshanian is defined as the first appearance of the trilobite Agnostotes orientalis around 494.2 million years ago.

GSSP The name is derived from Paibi, a village in Hunan, China. The GSSP is defined in the "Paibi section" (Wuling Mountains, Huayuan County), an outcrop of the Huaqiao Formation (花桥组). The base is the first occurrence of Glyptagnostus reticulatus which is 396 m above the base of the Huaqiao Formation at the type locality (28.3895°N 109.5257°E / 28.3895; 109.5257).

Major events At the turn of the Guzhangian and Paibian ages, an extinction event occurred that reduced the species richness by 45%. This event coincided with Marjuman extinction that can be traced to trilobite and brachiopod assemblages in Laurentia. Two phases of extinction can be traced in the sediments of South China: the first, with a slight decline in species, lasted in Guzhangian, about 1.8 million years; the second, with a sharper decline in richness, lasted 1.2 million years, more in the Paibian. After the extinction, species diversity returned to its previous level. Steptoean positive carbon isotope excursion (SPICE) began around the Guzhangian-Paibian boundary. This event is associated with a global carbon-cycle perturbation. The driving mechanism of this change are not fully understood, but it is believed to be caused by the expansion of anoxic deep water into shallow regions. SPICE event had a noticeable impact on trilobites. A decrease in their diversity is observed at the beginning and at the termination of its interval, which coincides with the Laurentian End-Marjuman Biomere Extinction (EMBE) and the End-Steptoean Biomere Extinction (ESBE), respectively. The SPICE event was accompanied by cooling, which contributed to the recovery of ecosystems after its onset, but the further warming disrupted the circulation of ocean waters and triggered new redox changes that precipitated the ESBE.

Paleontology Agnostoid genera, including Glyptagnostus, Homagnostus, Pseudagnostus and Acmarhachis, are known from the Paibian deposits.

References

External links "GSSP of the Furongian Series and Paibian Stage in the Paibi section, Hunan, China". timescalefoundation.org. Archived from the original on 2022-05-26. "GSSP Table - Paleozoic Era". Archived from the original on 2023-10-08. "GSSPs - The Cambrian System 2019". International Commission on Stratigraphy. Archived from the original on 2023-07-21.

Illustrations

Worked examples

Example 1 — a first encounter with Paibian

Start with the simplest possible case. Write down what Paibian 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 Paibian 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 Paibian 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 Paibian

In research: Paibian 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 Paibian 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: Paibian is common in secondary-school and first-year university syllabi. It links to neighbouring topics Cambrian geochronology, Cambrian stubs, Geological ages, so understanding it makes those chapters shorter.
In everyday life: Look for Paibian 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 Paibian in 20 minutes

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

Frequently asked questions

What is Paibian in simple terms?

The Paibian is the lowest stage of the Furongian Series of the Cambrian System. The Paibian is also the first age of the Furongian Epoch of the Cambrian Period.

Why does Paibian 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 Paibian?

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 Paibian.