Paleozoic: Ordovician Picture Credits: & Figure above from The Changing Earth, Exploring Geology and Evolution (3rd Edition: 2001) by James S. Monroe and Reed Wicander. Picture Credits: Figure above from The Changing Earth, Exploring Geology and Evolution (3rd Edition: 2001) by James S. Monroe and Reed Wicander. & Collection of fossils:
Paleozoic: Silurian Picture Credits: Figure above from The Changing Earth, Exploring Geology and Evolution (3rd Edition: 2001) by James S. Monroe and Reed Wicander. & Collection of fossils:
Paleozoic: Devonian Picture Credits: hhttp:// &hhttp:// Fossil:
Paleozoic: Mississippian Picture Credits: Fern Forrest: & Fern Fossil:
Paleozoic: Pennsylvanian Picture Credits: Environment Picture: Horsetail Rushes Fossil:
Mesozoic: Triassic Picture Credits: Eudimorphodon: & Triassic Araucariad Forest From Petrified Forest National Park Museum
Mesozoic: Jurassic Picture Credits: Eudimorphodon Skeleton: & Triassic Period Scene-From Smithsonian Collection:
Mesozoic: Late Jurassic Picture Credits: Dinosaur Track photo: William Beauchamp, July 2009 : Beauchampscapes.com/TRIPS/Dinosaur-Valley-State-Park.htm Canadian Museum Canadian Museum of Nature:
Mesozoic: Early Cretaceous Picture Credits:
Mesozoic: Mid-Cretaceous Picture Credits: Shell Fossil Collection: Single Shell:
Mesozoic: Late Cretaceous Picture Credits:
Cenozoic: Paleocene Picture Credits: Swamp: & Early Mammal (ptilodus):
Cenozoic: Eocene Canoe Formation Picture Credits: Canoe Formation: Volcano:
Cenozoic: Late Eocene Chisos Formation Picture Credits: Chisos Formation by B. Cornet: Volcano:
Cenozoic: Oligocene South Rim Formation Picture Credits: South Rim Formation: Volcano:
Cenozoic: Pliocene Picture Credits: River: & Black Bear:
Cenozoic: Pleistocene Picture Credits: River: & Black Bear: &/ html & Wild Boar:
Cenozoic: Holocene Picture Credits: River: & Black Bear: &/ html & Wild Boar: & Coyote: Boar: & Coyote: & Jack Rabbit: