Start with high-confidence geology books, then narrow by subgenre or adjacent topics.
Four Corners
Kenneth A. Brown
The Story of CO2 Is the Story of Everything
Peter Brannen
Annals of the Former World
John McPhee
Rockhounding California
Gail A. Butler, Shep Koss
Rockhounding Montana
Montana Hodges
Uranium Frenzy
Raye Ringholz
When the Ice Is Gone
Paul Bierman
Boom, Bust, Boom
Bill Carter
Earthquake Storms
John Dvorak
Dyke (geology)
Sabrina Imbler
Canyons of the Colorado
John Wesley Powell
Ancient Places
Jack Nisbet