Skip Navigation
You are viewing an older version of this Concept. Go to the latest version.

Principle of Uniformitarianism

Uniformitarianism states that what happens today also happened in the past with the same results.

Atoms Practice
Estimated3 minsto complete
Practice Principle of Uniformitarianism
This indicates how strong in your memory this concept is
Estimated3 minsto complete
Practice Now
Turn In
Down with Dogma-Uniformitarianism

Down with Dogma-Uniformitarianism


Credit: Dr. Julian Goldsmith
Source: http://en.wikipedia.org/wiki/File:J_Harlen_Bretz.jpg
License: CC BY-NC 3.0

Like Alfred Wegener with continental drift, J. Harlen Bretz had an outrageous hypothesis. He said that enormous ancient floods had ravaged the Pacific Northwest. Like Alfred Wegener, he was right.

What Created These Features?

  • In the early 20th century, uniformitarianism reigned in geology.
  • J. Harlen Bretz was a field geologist studying the Columbia River Plateau.
  • Bretz saw features he couldn’t explain with processes that people had witnessed.
  • Bretz said the channeled scablands (NOVA #9) were caused by massive flooding on an unimaginable scale.
  • His colleague, JT Pardee, found evidence of a giant ancient glacial lake.
  • Unlike Wegener, Bretz’s idea was accepted before his death.

Can You Apply It?

With the links below, learn more about the Missoula Floods. Then answer the following questions.

  1. Why did Glacial Lake Missoula drain so rapidly?
  2. What geological evidence is there for the existence of Lake Missoula?
  3. Why did other geologists think that the giant wavy landforms (#4) could not be ripple marks?
  4. Why did J. Harlen Bretz name the features near Grand Coulee the Channeled Scablands?
  5. Giant boulders in the Willamette Valley (#14) could have been deposited by a glacier. They could have been brought in by icebergs in a flood. How could you figure out how the boulders got there?
  6. Scientists still accept uniformitarianism. How can they accept it and catastrophism (the idea that catastrophic events do sometimes occur)?

Notes/Highlights Having trouble? Report an issue.

Color Highlighted Text Notes
Show More

Image Attributions

  1. [1]^ Credit: Dr. Julian Goldsmith; Source: http://en.wikipedia.org/wiki/File:J_Harlen_Bretz.jpg; License: CC BY-NC 3.0

Explore More

Sign in to explore more, including practice questions and solutions for Principle of Uniformitarianism.
Please wait...
Please wait...