earth science

Geoncheonri Formation

Geoncheonri 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 Geoncheonri Formation rather than just read about it. In short: The Geoncheonri Formation (Korean: 건천리층; Hanja: 乾川里層; RR: Geoncheolli-cheung) is an Early Cretaceous (Aptian-Albian) geologic formation of the Hayang Group in the Gyeongsang Basin of southeast South Korea. Fossil ornithopod tracks, as well as fossils of Kirgizemys have been reported from the lacustrine siltstones and mudstones of the formation.

Key takeaways

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

Reference excerpt

The Geoncheonri Formation (Korean: 건천리층; Hanja: 乾川里層; RR: Geoncheolli-cheung) is an Early Cretaceous (Aptian-Albian) geologic formation of the Hayang Group in the Gyeongsang Basin of southeast South Korea. Fossil ornithopod tracks, as well as fossils of Kirgizemys have been reported from the lacustrine siltstones and mudstones of the formation.

Description The Geoncheonri Formation (ca. 800 metres (2,600 ft) thick) is the uppermost formation of the Hayang Group, belonging to the Gyeongsang Supergroup. The Gyeongsang Supergroup is widely distributed in the southeastern part of the Korean Peninsula, mainly within the Gyeongsang Basin, which is the largest sedimentary basin of South Korea. It is divided into the Shindong and Hayang Groups, consisting mainly of thick siliciclastic sequences of alluvial, fluvial and lacustrine sediments, and the Yucheon Group, characterized by the dominance of volcanic rocks. The Hayang Group consists of Chilgok, Silla, Hakbong, Haman, Banyawol, Songnaedong, Chaeyaksan and Geoncheonri Formations in ascending order. The Geoncheonri Formation is conformably underlain by the Chaeyaksan Formation and overlain by the Jusasan Formation, the lowermost of the Yucheon Group. Since plant fossils were first reported in the Geoncheonri Formation in 1925, a series of paleontological studies has been made with molluscs, spores and pollen, charophytes, and dinosaur footprints. Plant fossils from the Geoncheonri Formation were correlated with the Monobegawa Group and the Gyliak Series (Lower to "Middle" Cretaceous) in Japan. Yang (1978) noted that the co-occurrence of a bivalve Trigonioides paucisulcatus in the Geonchonri Formation and in the Gyliakian Goshonoura Group (Cenomanian to Turonian) of Japan. However, primitive angiosperm pollen (Retimonocolpites peroreticulatus and Tricolpites sp.) and other palynological features suggest that the age of the Geoncheonri Formation is Aptian to Albian. The charophytes from the Geoncheonri Formation also indicate an Aptian to Albian age.

Fossil content The following fossils were reported from the formation:

Turtles Kirgizemys cf. exaratus Ostracods Cypridea sp. Lycopterocypris cf. profunda Cypria cf. elata Ichnofossils Ornithopoda indet. Theropoda indet.

See also List of dinosaur-bearing rock formations List of stratigraphic units with ornithischian tracks Ornithopod tracks Gugyedong Formation Haman Formation Hasandong Formation Jinju Formation Sagog Formation

References

Illustrations

Worked examples

Example 1 — a first encounter with Geoncheonri Formation

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

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

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

Frequently asked questions

What is Geoncheonri Formation in simple terms?

Why does Geoncheonri 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 Geoncheonri 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 Geoncheonri Formation.