earth science

Hasandong Formation

Hasandong 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 Hasandong Formation rather than just read about it. In short: The Hasandong Formation (Korean: 하산동층; Hanja: 霞山洞層; RR: Hasandong-cheung) is a Lower Cretaceous geologic formation in South Korea. It has been dated to the Aptian to possibly the earliest Albian stage.

Key takeaways

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

Reference excerpt

The Hasandong Formation (Korean: 하산동층; Hanja: 霞山洞層; RR: Hasandong-cheung) is a Lower Cretaceous geologic formation in South Korea. It has been dated to the Aptian to possibly the earliest Albian stage. The Hasandong Formation could be distinguished from the underlying Nakdong Formation and the overlying Jinju Formation by frequent intercalations of reddish beds. The paleoenvironment of this formation represents a floodplain with a meandering channel including occasional pond deposits. Meanwhile, the paleoclimate has been interpreted as a seasonal alternation of wet and dry seasons. Based on detrital zircons, Lee et al. 2010 and 2018 estimated the maximum depositional age of the formation at 118.0 ± 2.6 Ma, and suggested that the overlying Jinju Formation likely had a maximum depositional age of 112.4 ± 1.3 Ma. Chae et al. (2026) examined two fossiliferous localities of the upper Hasandong Formation on Yusu-ri, Jinju and on Jangguseom Island of Jungpyeong-ri, Hadong, and estimated the maximum depositional age on each site at 116.9 ± 1.5 Ma and 113.4 ± 1.4 Ma respectively. Fossils including plants, molluscs, diverse vertebrate remains including dinosaurs, turtles, and pterosaurs are known from this formation.

Fossil content

Invertebrate fossils Few fragments of insects have been discovered from the formation.

Molluscs

Ostracods Ostracod carapaces have been discovered from the formation.

Vertebrate fossils

Actinopterygii

Testudines Shell fragments of testudines have been discovered.

Crocodylomorpha Several teeth remain have been reported but are not assigned to the specific clade.

Pterosaurs

Dinosaurs Several indeterminate theropod teeth remains have been reported.

Eggs Unnamed dinosaur egg fossils have been reported.

Ichnofossils Tracks of theropods, sauropods and ornithopods have been discovered from the formation. Possible amphibian tracks are also known.

Paleoflora Macroflora of the Hasandong Formation suggests a shift toward seasonally semiarid conditions, dominated by conifers, compared to the underlying Nakdong Formation.

Photo

See also List of dinosaur-bearing rock formations List of stratigraphic units with few dinosaur genera Seonso Conglomerate Haman Formation

References

Bibliography Weishampel, David B.; Dodson, Peter; Osmólska, Halszka (2004), The Dinosauria, 2nd edition, Berkeley: University of California Press, pp. 1–880, ISBN 0-520-24209-2, retrieved 2019-02-21{{citation}}: CS1 maint: publisher location (link)

Illustrations

Worked examples

Example 1 — a first encounter with Hasandong Formation

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

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

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

Frequently asked questions

What is Hasandong Formation in simple terms?

Why does Hasandong 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 Hasandong 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 Hasandong Formation.