University of Kentucky
University of Kentucky: Important Dates and Cool Creatures in Earth History
A bullet list of important events in Earth's history broken down by eons, eras, periods, and epochs.
Other
Radford University: Environmental History Timeline
Worrying over the environment is nothing new, just the term "environmental" is. Investigate the history of concerns dating back to ancient civilization and looking forward into the future.
Utah State University
Teacher Link: Celebrations: A Resource Guide for Teachers
TeacherLINK at Utah State University offers a wealth of topics and project information on celebrations held throughout the world. Click on "Topics and Authors," to access a long list of available lesson plans on a variety of...
US Geological Survey
Usgs: What Is Geologic Time?
Understand the evidence for ancient earth and the geologic time scale. Learn on this site how the earth can help scientist date discoveries.
Curated OER
National Park Service: What Is Geologic Time?
A discussion of geologic time, along with a presentation of evidence for the time span involved.