Geological formation

High school (ages 12+)
Environment & Earth

Name:

Date:

Step 1 · Read the article

Open the article and read it at the level above. Then answer the questions below in your own words.

https://smallwhale.org/articles/geological-formation

Write what each word means, using the article.

Do not copy the article. Write two things you learned, the way you would explain them to a friend.

Answers below are taken from the article’s stored facts, so they match what the student read.

1. What is the lithostratigraphic unit?The fundamental unit of lithostratigraphy, defined by physical rock characteristics (lithology)
2. What is the mapping criterion?Must possess sufficient mappable extent at the surface or in the subsurface
3. Why do geological formations need to be mapped?Mapping formations lets scientists see how rocks are arranged on the surface and underground. It helps them understand past earthquakes, mountains, and where useful resources might be hidden.
4. How can a formation be made from different rock types?A formation can be made of one rock type, or it can have layers of many different rocks that still look similar enough to be grouped together. The mix of rocks still makes the formation distinct from the surrounding layers.

Lithostratigraphy: The branch of stratigraphy that classifies rock strata based on their lithological features.
Stratigraphic Column: A graphic representation of the succession of rock strata in a given area, showing their lithology and relationships.
Tectonic History: The record of the deformation and movement of the Earth's crust over geological time.
Sedimentation: The process by which sediments accumulate in layers, eventually forming sedimentary rock.