[Free Registration/Login may be required to access all resource tools.] How the geologic time scale is divided.

Pictures of fossils are arranged in chronological sequence and by geologic period. Pictures include scientific names and location where the fossils were found.

An overview of the different geologic time periods and how each affected the area of what is now the state of Arkansas.

An image gallery of fossils through time. Students choose a time period to see what life was like by studying the fossils.

This timeline is a good resource if you are looking for brief descriptions of the geologic periods. Descriptions include pictures of common organisms for each period and the range of time covered by each period.

This 2-page handout provides short descriptions of the different aeons, eras, and periods in the Earth's geological history.

A time line of Earth's geologic periods from 600 million years ago.

In this lesson learners will look at the major divisions of geologic time and learn about the fossils and forms of life which existed during those periods, helping them to understand how the age of rocks are preserved.

Examine the enthralling world of the Irish elk by uncovering details about its behaviors, habitats, geological time periods, and classification through photos, a video, descriptions, and external links.

Explore the exciting world of the woolly mammoth by discovering facts about its behaviors, habitats, geological time periods, and classification through news, photos, videos, descriptions, and external links.

This resource provides basic information of the changes that took place during the Permian period as well as the animals that populated the Earth during this time.

Learn the basic information about the Mesozoic Era in Earth's geologic history.

A brief overview illustrating the Paleozoic era in Earth's geologic history.

A map from 1910 of Mexico and Central America, showing the distribution of rocks and indicating the geologic time period they come from.

A comprehensive timeline of events in the prehistory and history of Ohio. Hyperlinks to the multitude of specific articles about Ohio's history.

This resource provides detailed information on each of the periods within the Precambrian Era. It discusses what earth was like, what the first multiple cell organisms were like and when they appeared.

A virtual tour of a Silurian reef. Includes information on geologic principles, the geologic time scale, and the Silurian period. Explores Silurian reefs and reef organisms.

This nonfiction children's book was created by 1st grade students at the Genesee Valley Community Charter School in Rochester, New York, as part of a learning expedition on fossils and local geological history. The expedition consisted...

Students will look at their schoolyard and determine where a puddle will form after a heavy rain. They will map the school yard and draw chalk lines to demonstrate their predictions. After a rain children will check their predictions and...