Historical Geology is a free online textbook for Historical Geology courses. It includes the following chapters, as well as a series of case studies, virtual field experiences, tools of the trade, and virtual sample sets.

Chapters:
What is Historical Geology?
A Brief History of Earth
Earth as a System
Earth Materials – The Rock-Forming Minerals
Earth Materials – Rocks
Plate Tectonics
Geologic time
Evolution Part I: The Theory
Taphonomy: The Science of Death and Decay
Innovations of Life Through Time: Life Finds a Way
Stratigraphy – The Pages of Earth’s Past
Using sedimentary structures to interpret ancient environments
Facies
Paleoclimatology

Historical geology is a discipline that uses the principles and methods of geology to reconstruct the geological history of Earth. Historical geology examines the vastness of geologic time, measured in billions of years, and investigates changes in the Earth, gradual and sudden, over this deep time. It focuses on geological processes, such as plate tectonics, that have changed the Earth's surface and subsurface over time and the use of methods including stratigraphy, structural geology, paleontology, and sedimentology to tell the sequence of these events. It also focuses on the evolution of life during different time periods in the geologic time scale.