This is a nice explanation of geologic time and Earth's major eras. Although this site is designed for younger students, it is mostly text with few images.

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

An extensive biography of William Morris Davis (1850-1934 CE), often called "The father of American geography." He was one of the founders of the Association of American Geographers and a regular contributor to the National Geographic...

Earth's magnetic poles have reversed themselves throughout its long history. Find out what scientists know about these reversals. A geologic time line shows when the reversals occurred.