Pliocene Epoch, Marine Fossils
Science Source
Fossilized Shark Tooth #1
Scott Camazine
Prehistoric Men Battle Cave Bear
Science Source
Megatherium, Cenozoic Mammal #7
Science Source
Saber-toothed Cat, Smilodon
Science Source
Whale Ear Bone Fossil #1
Millard H. Sharp
Saber-toothed Cats
Photo Researchers
Prehistoric Men Battle Cave Bear
British Library
Megatherium, Cenozoic Mammal #4
Science Source
Saber Tooth Cat
Millard H. Sharp
Fossilized Shark Tooth #2
Scott Camazine
Cathedral Gorge State Park #1
Theodore Clutter
Sandstone Spires
Theodore Clutter
Harlans Giant Ground Sloth
Millard H. Sharp
Sandstone Erosion #2
Theodore Clutter
Homo Erectus Skull And Facial
Spencer Sutton
Fossilized Shark Tooth
Scott Camazine
Sandstone Erosion
Theodore Clutter
Sandstone Erosion #1
Theodore Clutter
Bark Beetle In Amber
Phil DEGGINGER
Scuttle Fly In Amber #1
Phil DEGGINGER
Megatherium, Cenozoic Mammal #3
Science Source
Megatherium, Cenozoic Mammal #5
Science Source
Homo Erectus Facial Reconstruction #1
Spencer Sutton
Hagerman Horse
Roger Hall
Tertiary Period, Illustration
Spencer Sutton
Fossilized Shark Tooth #3
Scott Camazine
Harlans Giant Ground Sloth #1
Millard H. Sharp
American Mastodon
Millard H. Sharp
Cathedral Gorge State Park
Theodore Clutter
Cathedral Gorge State Park #2
Theodore Clutter
Scuttle Fly In Amber
Phil DEGGINGER
Fungus Gnat In Amber
Phil DEGGINGER
Psocoptera In Amber
Phil DEGGINGER
Homo Erectus Facial Reconstruction
Spencer Sutton
Megatherium, Cenozoic Mammal #6
Science Source
Table Of Stratified Rocks, 1888
Science Source