High schoolers use fossils found in rocks to determine the age of the strata between Rock Island and Chicago. Pupils pretend they are geologists. They must determine the age of all rock layers between the Mississippi River and Lake...

Students use fossils found in rocks to determine the age of rock in Illinois. They use a chart to identify the fossils and then identify the periods of rock.

Students draw maps of counties that were important to the discovery of plate tectonic theory.  In this plate tectonics lesson students excavate constructed fossil sites from matching coastlines and discuss the possible explanations...

A lengthy scholarly article that discusses the geologic time scale, its history of development, age-dating events that occurred in different eras, and how absolute and relative dating are used to assess the ages of the Earth and Moon....