Dinosaur Hill, Colorado
Francois Gohier
Crossbedding In Utah
James Steinberg
Clay Varves
George Whitely
Cross-bedded Sandstone
Charlie Ott
South Rim, Grand Canyon
James Zipp
Georges Cuvier, French Naturalist #2
Science Source
Georges Cuvier, French Naturalist #3
Science Source
Georges Cuvier, French Naturalist #4
Science Source
Earths Crust
Science Source
Pumice Layers
Chris Bjornberg
Charles Lyell, English Geologist
Science Source
Georges Cuvier, French Naturalist
Science Source
Georges Cuvier, French Naturalist #1
Science Source
Georges Cuvier, French Naturalist #5
Science Source
Georges Cuvier, French Naturalist #7
Science Source
Georges Cuvier, French Naturalist #6
Science Source
Toroweap Overlook, Grand Canyon
Mark Newman
Georges Cuvier, French Naturalist
Wellcome Images
Georges Cuvier, Stratigraphic Profile
British Library
South Rim Of The Grand Canyon
James Zipp
Hiker In The Grand Canyon
Mark Newman
Toroweap Overlook, Grand Canyon #1
Mark Newman
Grand Canyon Near Mather Point
Gregory G. Dimijian, M.D.