Manhattan Schist #1
John Kaprielian
Layered Outcrops On Mars
NASA/JPL-Caltech
Manhattan Schist
John Kaprielian
Moru Kopje, Serengeti
Gregory G. Dimijian, M.D.
Chiricahua National Monument
Mark Newman
Peggys Point Lighthouse, Nova Scotia #1
Theodore Clutter
Iron Oxide Stains
Charlie Ott
Cretaceous Granodiorite Outcrops, Idaho #1
William Mullins
Cretaceous Granodiorite Outcrops, Idaho #2
William Mullins
Cretaceous Granodiorite Outcrops, Idaho
William Mullins
Igneous Outcrop
E.r. Degginger
Grand Canyon West
Mark Newman
Orange Lichens
Ted Kinsman
Cliffs Of Tsingy Limestone, Madagascar
Greg Dimijian
Tsingy Limestone, Madagascar
Greg Dimijian
Granite From The Idaho Batholith
William Mullins
Buffalo National River, Arkansas
Bruce Roberts
Coal Seams In A Cliff Face
Charlie Ott
Rock Formation, Utah National Park #1
Photo Researchers, Inc.
Trench Dug By Opportunity On Mars
NASA / JPL-Caltech
Mars Surface From Opportunity
NASA / JPL-Caltech
Martian Rock #1
NASA / JPL-Caltech / Cornell Univserity
Chiricahua National Monument #1
Mark Newman
Chiricahua National Monument #2
Mark Newman
Point Reyes Historic Lighthouse
Ron Sanford
Rock Formation, Mexico
Art Wolfe
The Devils Tower National Monument
Rafael Macia
Columnar Basalt In Idaho
William H. Mullins
Red Sandstone
Richard and Ellen Thane
Spider Rock, Canyon De Chelly
George Ranalli
John Day Fossil Beds #1
Tracy Knauer
John Day Fossil Beds
Jim Corwin
Chiricahua Mountains, Arizona
Gregory G. Dimijian, M.D.
Soit Ngum Kopje, Serengeti
Gregory G. Dimijian, M.D.
Metamorphic Rocks
Gregory G. Dimijian, M.D.
Serengeti Kopje
Gregory G. Dimijian, M.D.
Crumpled Strata Of Metamorphic Rocks
Gregory G. Dimijian, M.D.
Remarkable Rocks #2
Gregory G. Dimijian, M.D.
Stair Hole, Dorset, England
G. R. Roberts
Colorful Sandstone In Arizona
Adam Jones
Joshua Tree National Park
Jeffrey Lepore
Balanced Rocks In Arizona
James Steinberg
Devils Tower, Wyoming
ER Degginger
Cowboys Chasing Horses
Jean-Louis Klein & Marie-Luce Hubert
Cowboys Chasing Horses #1
Jean-Louis Klein & Marie-Luce Hubert
Badlands, Theodore Roosevelt Np
Willard Clay
Granite Sea Stack, Malaysia
Fletcher & Baylis
Tree On A Rock
Richard Hansen
Saudi Arabian Desert #3
Ray Ellis
Granite Layer
Karl H. Switak
Peggys Point Lighthouse, Nova Scotia
Theodore Clutter
Volcanic Dike In Granite
A.b. Joyce
Pancake Rocks, New Zealand
A.b. Joyce
La Paz, Bolivia
Marcello Bertinetti
Red Sandstone Cliff, Utah
Charlie Ott
Sandstone Caprock, Utah
Charlie Ott
Atacama Desert, Chile #1
C.r. Sharp
Milky Quartz Boulders
Kenneth Murray
Eroded Red Sandstone, Utah
Charlie Ott
Chrysocolla Deposit
Charlie Ott
Balanced Rock In Utah
Charlie Ott
Mt. Le Conte, Tennessee
Kenneth Murray
Cross-bedded Sandstone
Charlie Ott
Metamorphic Rock
Charles Angelo
Metamorphic Rock In North Carolina
Kenneth Murray
Cimarron National Grassland
James Steinberg
Devils Postpile National Monument #1
Brenda Tharp
Dunluce Castle, County Antrim, Northern
James Steinberg
Diabase Sill #1
Carleton Ray