1. Paleozoic: Ordovician Picture Credits: http://www.sunstar-solutions.com/sunstar/geology/Permian/PermianTX.htm &http://www.sunstar-solutions.com/sunstar/geology/Permian/PermianTX.htm Figure 22.11 above from The Changing Earth, Exploring Geology and Evolution (3rd Edition: 2001) by James S. Monroe and Reed Wicander. http://www.humboldt.edu/natmus/lifeThroughTime/Ordovician.web/index.htmlml Picture Credits: Figure 22.11 above from The Changing Earth, Exploring Geology and Evolution (3rd Edition: 2001) by James S. Monroe and Reed Wicander. http://www.humboldt.edu/natmus/lifeThroughTime/Ordovician.web/index.htmlhttp://www.humboldt.edu/natmus/lifeThroughTime/Ordovician.web/index.html & Collection of fossils: http://www.sunstar-solutions.com/sunstar/geology/Permian/PermianTX.htm

2. Paleozoic: Silurian Picture Credits: Figure 22.11 above from The Changing Earth, Exploring Geology and Evolution (3rd Edition: 2001) by James S. Monroe and Reed Wicander. http://www.humboldt.edu/natmus/lifeThroughTime/Ordovician.web/index.htmlhttp://www.humboldt.edu/natmus/lifeThroughTime/Ordovician.web/index.html & Collection of fossils: http://www.sunstar-solutions.com/sunstar/geology/Permian/PermianTX.htm

3. Paleozoic: Devonian Picture Credits: hhttp://www.astrobio.net/pressrelease/3497/on-the-backs-of-fishes &hhttp://www.astrobio.net/pressrelease/3497/on-the-backs-of-fishes Fossil: http://louisvillefossils.blogspot.com/2010_06_27_archive.html

4. Paleozoic: Mississippian Picture Credits: Fern Forrest: http://www.nps.gov/bibe/naturescience/commonplants2.htm &http://www.nps.gov/bibe/naturescience/commonplants2.htm Fern Fossil: http://louisvillefossils.blogspot.com/2010/04/st-clair-pennsylvania-fern-fossils.htmlpennsylvania-fern-fossils.html

5. Paleozoic: Pennsylvanian Picture Credits: Environment Picture: http://rst.gsfc.nasa.gov/Sect20/A12c.html Horsetail Rushes Fossil: http://www.flickr.com/photos/hornbeam/4440435327/in/set-72157623624205044/http://www.flickr.com/photos/hornbeam/4440435327/in/set-72157623624205044/

6. Mesozoic: Triassic Picture Credits: Eudimorphodon: http://www.texas-geology.com/Texas%20Triassic%20Dinosaurs.html &http://www.texas-geology.com/Texas%20Triassic%20Dinosaurs.html Triassic Araucariad Forest From Petrified Forest National Park Museum http://www.texas-geology.com/Texas%20Triassic%20Dinosaurs.html

7. Mesozoic: Jurassic Picture Credits: Eudimorphodon Skeleton: http://www.texas-geology.com/Texas%20Triassic%20Dinosaurs.html &http://www.texas-geology.com/Texas%20Triassic%20Dinosaurs.html Triassic Period Scene-From Smithsonian Collection: http://www.texas-geology.com/Texas%20Triassic%20Dinosaurs.html

8. Mesozoic: Late Jurassic Picture Credits: Dinosaur Track photo: William Beauchamp, July 2009 : http://www.texasescapes.com/TRIPS/Dinosaur-Valley-State-Park.htmWilliam Beauchampscapes.com/TRIPS/Dinosaur-Valley-State-Park.htm Canadian Museum Canadian Museum of Nature: http://animals.howstuffworks.com/dinosaurs/apatosaurus.htm

9. Mesozoic: Early Cretaceous Picture Credits: http://www.marshalls-art.com/pages/ppaleo/largepaleo/largepg21/Ammonite.htmhttp://www.marshalls-art.com/pages/ppaleo/largepaleo/largepg21/Ammonite.htm http://louisvillefossils.blogspot.com/2009/10/texas-ammonite-fossil.html

10. Mesozoic: Mid-Cretaceous Picture Credits: Shell Fossil Collection: http://texascichlidmassacre.blogspot.com/2010_04_01_archive.htmlhttp://texascichlidmassacre.blogspot.com/2010_04_01_archive.html Single Shell: http://www.proctormuseum.us/Shells/shells.htm

11. Mesozoic: Late Cretaceous Picture Credits: http://picasaweb.google.com/lh/photo/oknYQ_Uh7MdPJzLflB4Wjwhttp://picasaweb.google.com/lh/photo/oknYQ_Uh7MdPJzLflB4Wjw

12. Cenozoic: Paleocene Picture Credits: Swamp: http://picasaweb.google.com/lh/photo/oknYQ_Uh7MdPJzLflB4Wjw &http://picasaweb.google.com/lh/photo/oknYQ_Uh7MdPJzLflB4Wjw Early Mammal (ptilodus): http://tech.dir.groups.yahoo.com/group/MammalPaleontology/message/848essage/848

13. Cenozoic: Eocene Canoe Formation Picture Credits: Canoe Formation: http://www.traveldudes.org/travel-tips/3-parks-1-big-bend-national-park-texas-usa/2122http://www.traveldudes.org/travel-tips/3-parks-1-big-bend-national-park-texas-usa/2122 Volcano: http://www.solarnavigator.net/volcanoes.htm

14. Cenozoic: Late Eocene Chisos Formation Picture Credits: Chisos Formation by B. Cornet: http://www.sunstar-solutions.com/sunstar/geology/BigBend/BigBendTX.htm Volcano: http://www.solarnavigator.net/volcanoes.htmhttp://www.solarnavigator.net/volcanoes.htm

15. Cenozoic: Oligocene South Rim Formation Picture Credits: South Rim Formation: http://www.nationalparkstraveler.com/2010/03/big-bend-national-park-offers-drastic-change-vistas-easterner-accustomed-seeing5469http://www.nationalparkstraveler.com/2010/03/big-bend-national-park-offers-drastic-change-vistas-easterner-accustomed-seeing5469 Volcano: http://www.solarnavigator.net/volcanoes.htm

16. Cenozoic: Pliocene Picture Credits: River: http://passengerview.wordpress.com/2008/07/04/dinosaur-footprints-and-a-beautiful-river/ &http://passengerview.wordpress.com/2008/07/04/dinosaur-footprints-and-a-beautiful-river/ Black Bear: http://www.bigbendgazette.com/blog/Archive/Area/BigBendNationalPark/_archives/2006/11/18/2533656.html/2533656.html

17. Cenozoic: Pleistocene Picture Credits: River: http://passengerview.wordpress.com/2008/07/04/dinosaur-footprints-and-a-beautiful-river/ &http://passengerview.wordpress.com/2008/07/04/dinosaur-footprints-and-a-beautiful-river/ Black Bear: http://www.bigbendgazette.com/blog/Archive/Area/BigBendNationalPark/_archives/2006/11/18/2533656.html &/2533656.html & Wild Boar: http://rockmoornews.blogspot.com/

18. Cenozoic: Holocene Picture Credits: River: http://passengerview.wordpress.com/2008/07/04/dinosaur-footprints-and-a-beautiful-river/ &http://passengerview.wordpress.com/2008/07/04/dinosaur-footprints-and-a-beautiful-river/ Black Bear: http://www.bigbendgazette.com/blog/Archive/Area/BigBendNationalPark/_archives/2006/11/18/2533656.html &/2533656.html & Wild Boar: http://rockmoornews.blogspot.com/ & Coyote: http://www.big.bend.national-pWild Boar: http://rockmoornews.blogspot.com/ & Coyote: http://www.big.bend.national-park.com/sights.htm & Jack Rabbit: http://www.schwartzkopf.com/wade/photo/bigbend/