earth science

Taghanic event

Taghanic event 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 Taghanic event rather than just read about it. In short: The Taghanic event (Taghanic unconformity, Taghanic crisis or Taghanic onlap) was an extinction event that occurred about 386 million years ago during the Givetian faunal stage of the Middle Devonian geologic period in the Paleozoic era. It was caused by hypoxia from an anoxic event.

Key takeaways

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

Reference excerpt

The Taghanic event (Taghanic unconformity, Taghanic crisis or Taghanic onlap) was an extinction event that occurred about 386 million years ago during the Givetian faunal stage of the Middle Devonian geologic period in the Paleozoic era. It was caused by hypoxia from an anoxic event. The event had a period in which dissolved oxygen in the Earth's oceans was depleted. The Taghanic event caused a very high death rate of corals. The loss of the coral reefs caused a high loss of animals that lived in and around the reefs. The extinction rate has been estimated between 28.5% and 36%, making it the eighth largest extinction event recorded. The reduced oxygen levels resulted from a period of global warming caused by Milankovitch cycles. In the Taghanic event, sea levels were higher. After the Taghanic event, sea life recovered in the Frasnian faunal stage starting 382.7 million years ago. The Taghanic event was followed by the Kellwasser event (372 ma) and the Hangenberg event (359 ma).

Extinctions The Taghanic event at the Givetian/Frasnian boundary caused many extinctions, including the disappearance of about 50% of coral genera. About 47% of stromatoporoid sea sponge genera disappeared. Many Bryozoa were also lost. The diversity of ammonoids, trilobites, as well as tabulate and rugose corals were reduced. Thamnopora boloniensis, a tabulate coral, became extinct.

Sediments Old Red Sandstone continent sediments have been studied to evaluate the Taghanic extinction event. The Taghanic event was discovered by studying sudden sedimentary layer changes, faunal changes, and palaeobiogeographic events. The Taghanic event is found in the Tully Formation and Marcellus Formation in New York and Pennsylvania, including the Windom shale there. The Mahantango Formation in Pennsylvania, West Virginia, and Maryland also record the Taghanic event. The Taghanic event has been found in Tafilalt, Morocco in the eastern Anti-Atlas mountain range. The Orcadian Basin in Scotland has exposed rocks from the Taghanic event.

Taghanic onlap The period of global warming that caused the Taghanic event melted ice caps, causing sea levels to rise. This caused the Taghanic onlap, the submergence of land by the advancing sea. The advancing sea laid down strata deposits on the seafloor. The flooding of what is now the southwestern United States created a shallow marine environment.

Gallery

See also Late Devonian mass extinction Kačák event Emsian

References

Illustrations

Worked examples

Example 1 — a first encounter with Taghanic event

Start with the simplest possible case. Write down what Taghanic event 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 Taghanic event 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 Taghanic event 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 Taghanic event

In research: Taghanic event 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 Taghanic event 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: Taghanic event is common in secondary-school and first-year university syllabi. It links to neighbouring topics Extinction events, History of climate variability and change, Late Devonian extinctions, so understanding it makes those chapters shorter.
In everyday life: Look for Taghanic event 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 Taghanic event in 20 minutes

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

Frequently asked questions

What is Taghanic event in simple terms?

Why does Taghanic event 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 Taghanic event?

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 Taghanic event.