Earth's First 3.7 Billion Years Lecture notes from an online course. http://rainbow.ldeo.columbia.edu/courses/v1001/7.html (Added: Fri Feb 14 2003)
The Growth of Canada An online slideshow showing the geologic evolution of Canada with emphasis on the Precambrian interval. http://www.science.ubc.ca/~eoswr/slideshow/accounts/lithoprobe/slidefiles/growth0.html (Added: Fri Feb 14 2003)