Iowa DOT's policy
is to be
sensitive to the environment
and foster and enhance
environmental stewardship.
IOWA DEPARTMENT OF TRANSPORTATION
Presents
Rocks and Roads
Unit
1: Geology of Iowa
- Iowa's Geologic Time Scale -- Understand the framework of geological time.
- What is a rock? -- Learn that rocks are not the same.
- Iowa's Sedimentary Rocks and Environments -- Understand where and how rocks are found in Iowa were formed.
- How Geology Affects Iowa's Landscapes -- Learn about present- day landscapes and how these relate to geology.
- Unit 1 Summary
- Unit 1 Glossary -- Definitions provided for the terms discussed in this unit.
- Unit 1 Activities -- Activities will allow students to reinforce the materials covered in this unit.
A. Iowa's Geologic Time Scale
There are rocks of many different ages in Iowa. When
studying the
earth's history, you learn about the different periods and what
happened during each period. The three general eras in the
Phanerozoic Eon geologic time line are:
these periods, look for more information on the Bedrock Geology of Iowa (courtesy of the Geological Survey Bureau, Iowa Department of Natural Resources).
To help you understand the geologic time
scale, let us compare it to a
calendar year from January to December.
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