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Wasatchian

Wasatchian is a 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 Wasatchian rather than just read about it. In short: The Wasatchian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 55,000,000 to 50,100,000 years BP. It is usually considered to be within the Eocene, more specifically the Early Eocene.

Key takeaways

  • Wasatchian belongs to science; place it in that map before memorising details.
  • Learn the definition first, then one example that makes the definition concrete.
  • Connect Wasatchian to a quantity you can measure, compute or draw — that is where exam questions come from.
  • Reproduce the core statement of Wasatchian from memory before moving on to harder problems.

Reference excerpt

The Wasatchian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 55,000,000 to 50,100,000 years BP. It is usually considered to be within the Eocene, more specifically the Early Eocene. The Wasatchian is preceded by the Clarkforkian and followed by the Bridgerian NALMA stages.

Definition The age is named after the Wasatch Formation, a highly fossiliferous stratigraphic unit stretching across six of the United States from Idaho and Montana in the north through Utah and Wyoming to Colorado and New Mexico in the south.

Substages The Wasatchian is considered to contain the following substages:

Sandcouleean: shares lower boundary with the beginning of the Wasatchian age and shares upper boundary with the base of the Graybullian. Graybullian: shares lower boundary with the end of the Sandcouleean subage and upper boundary with the base of the Lysitean. Lysitean: shares lower boundary with the end of the Graybullian subage and upper boundary with the base of the Lostcabinian. Lostcabinian: shares lower boundary with the end of the Lysitean subage and upper boundary with the beginning of the Bridgerian.

Wasatchian correlations

References

Worked examples

Example 1 — a first encounter with Wasatchian

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

In research
Wasatchian appears in 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 Wasatchian 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
Wasatchian is common in secondary-school and first-year university syllabi. It links to neighbouring topics Eocene animals of North America, Eocene life, Geochronology stubs, so understanding it makes those chapters shorter.
In everyday life
Look for Wasatchian 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 Wasatchian in 20 minutes

  1. Read the reference excerpt below once, without taking notes.
  2. Close the page and write down what Wasatchian means in your own words.
  3. Compare your version with the excerpt and mark what you missed.
  4. Work through the three examples above with pen and paper.
  5. Explain Wasatchian out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Wasatchian in simple terms?

The Wasatchian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 55,000,000 to 50,100,000 years BP. It is usually considered to be within the Eocene, more specifically the Early E…

Why does Wasatchian matter?

Because it connects several 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 Wasatchian?

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 Wasatchian.

Tags

  • Eocene animals of North America
  • Eocene life
  • Geochronology stubs
  • Wasatchian

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