THE NATS 104 Assigned Readings for Lecture 3 include 

Dott, R.H., Jr. & Prothero, D.R. "Evolution of the Earth" 5th ed., McGraw-Hill (2001)
p. 422-448. 

These are available online as PDF files (URL and password have been
announced in class)
Here's what to do
  - Log On http://ereserves.library.arizona.edu/ers_search/OSCRsrchform.php3
  - Select Our Class (NATS104 section 12)
  - Enter the PASSWORD that was given in class