I once remarked to a fellow airline pilot, "I wish I'd taken a geology class in college. I'd like to know what I'm looking at when we fly over these beautiful vistas." He recommended Shelton's _Geology Illustrated_. I'm glad he did.

Shelton was a pilot, and his book is filled with aerial photographs to help the reader understand macroscopic geologic concepts. I found this to be particularly useful, like a lexicon to help me understand the story being told below me.

I particularly recommend this book to my fellow airline pilots. It'll add a whole new dimension to your flights.