Skip Navigation

Sedimentary Rocks

Sediments are weathered from rocks and are transported and deposited in a sedimentary environment.

Atoms Practice
This indicates how strong in your memory this concept is
Practice Now
Turn In
The Seas Go In and Out

The Seas Go In and Out

License: CC BY-NC 3.0

The Paleozoic rocks of the Grand Canyon formed in environments that didn’t look anything like the Grand Canyon does now. Shallow seas, beaches, and sand dunes led to those rock layers.

Amazing But True!

  • The acronym DUDE summarizes the geology of the Grand Canyon: deposition, uplift, downcutting and erosion.
  • The D in the acronym DUDE stands for deposition. Specifically, it is about the deposition of the Paleozoic sedimentary rocks.
  • During the Paleozoic Era, shallow seas covered this region four times.
  • Here are the rock types and the environment where they are deposited: Sandstone – beach or nearshore; shale – shallow, low energy offshore; limestone – shallow marine.
  • Credit: U.S. States Department of the Interior
    Source: http://en.wikipedia.org/wiki/File:Stratigraphy_of_the_Grand_Canyon.png
    License: CC BY-NC 3.0

    Stratigraphy showing age, placement, thickness of rocks in the Grand Canyon[Figure2]

  • In a marine transgression the sea moves inland to cover the land. In a marine regression, the sea moves out and the land again becomes exposed.

Explore More

With the links below, learn more about the rocks of the Grand Canyon. Then answer the following questions.

  1. Give the names of the rock layers deposited as a shallow sea moves over the land in the Grand Canyon region.
  2. Give the names of the rock layers deposited during a marine regression.
  3. What was different about the environment of deposition for the Tapeats Sandstone versus the Coconino Sandstone? How do you know?
  4. What explanation is there for this statement: the Muav Limestone is thicker in the western areas of the Canyon than in the east?

Notes/Highlights Having trouble? Report an issue.

Color Highlighted Text Notes
Show More

Image Attributions

  1. [1]^ License: CC BY-NC 3.0
  2. [2]^ Credit: U.S. States Department of the Interior; Source: http://en.wikipedia.org/wiki/File:Stratigraphy_of_the_Grand_Canyon.png; License: CC BY-NC 3.0

Explore More

Sign in to explore more, including practice questions and solutions for Sedimentary Rocks.
Please wait...
Please wait...