A visualization activity where students can conceptualize the age of the Earth by observing dots on paper, making calculations and estimations, and discussing their findings with classmates.

This interactive view of drifting continents will help you relate their positions to particular geologic eras. You can get detailed information on each of the eras as well.

This site provides a brief overview of the Precambrian Era and provides a clickable chart that breaks down this era into five different time frames. A lot of info is provided on each of the five.

Journey into the past while reading this comprehensive overview of the Silurian Period that covers topics such as life in the seas, invasion of land, fossil evidence, and climate and geology.

Geological eras showing the fossils found in each rock layer.

Journey into the past while reading this comprehensive overview of the Cambrian Period that covers topics such as the Cambrian Explosion, Burgess Shale fauna, trilobites, fossil evidence, and climate and plate tectonics.

Journey into the past while reading this comprehensive overview of the Ordovician Period that covers topics such as reef ecosystems, Paleozoic Fauna, fossil evidence, and climate and plate tectonics.

Journey into the past while reading this comprehensive overview of the Archaean Eon that covers topics such as early continents and oceans, first life on Earth, Earth's atmosphere, fossil evidence, and plate tectonics.

Journey into the past while reading this comprehensive overview of the Proterozoic Eon that covers topics such as the Prokaryotic life, Eukaryotes, glaciation, fauna evidence, and multicellular life forms.

Overview of the Earth in the Pleistocene Epoch told by photos, news, and external links with an emphasis on what grew then, what lived then, the causes of mass extinction, types of fossils, and what life was like in general.

Overview of the Earth in the Cretaceous Period told by photos, news, and external links with an emphasis on what grew and lived then, the causes of mass extinction, types of fossils, and what life was like in general.

Watch the earth change with this interactive app? What did Earth look like 250 million years ago? Or 1 billion years ago? Or 4.5 billion years ago? What was the climate like in the deep past? Find the answers with EarthViewer, an...

[Free Registration/Login Required] This flipchart is a lesson on the geologic history of the Earth. It covers the four main eras of the geologic time scale: Precambrian, Paleozoic, Mesozoic, and Cenozoic. Characteristics of each era are...

Through this resource, in outline format, information is presented about the global setting and life in the Cretaceous.

Images of fossils are listed by taxon. Fossils are also listed by location and geologic era.

College-level biology book covers the Late Paleozoic geologic time period in Earth's history. See photographs of fossil evidence from that era in addition to diagrams to help with understanding.

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.

An overview of the Jurassic Period, including links to more detailed information about the geology and biological changes of the period.

[Free Registration/Login may be required to access all resource tools.] Summarizes the key points about geological processes that took place during the Precambrian Era. Includes a few questions to check for understanding.

Presents some facts about crinoids, a marine animal abundant during the Paleozoic Era, with many fossil species present in Indiana. This animal can still be found in the Caribbean Sea today.

Describes plants and animals that lived during the Ordovician Period, where it falls in the geologic time scale, tectonic activity happening then, the climate and environment, and extinction events.

Information about the Mesozoic Era, including details and extensive links about the geology and biology of the period. A very thorough site that is geared toward 5 - 8th grades, but useful for all.

A slideshow will introduce the process of climate change that the earth has experienced since the beginning of time. Discover "leaf margin analysis" which scientists use while studying fossils to determine the temperatures they were...

Overview of the Earth in the Cambrian Period told by photos, news, and external links with an emphasis on what grew and lived then, the causes of mass extinction, types of fossils, and what life was like in general.