It was through a letter dated March 30, 1579 that Giovanni Arduino announced the four orders that form the basis of ...

We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...

Definitions and illustrations of the principles of stratigraphy. Be sure to step through all the principles. Stop when you reach the page on the Geologic Time Scale. The textbook is not necessarily ...