1. Evolution of the Earth 13.7 Billion Years in the Making
PART 8: Pennsylvanian
Dr. Gregg Wilkerson
Earth Science
Bakersfield City College

2. Pennsylvanian: 300 Million Years Ago

3. Alleghenian Orogeny: 325 to 256 Million Years Ago (also called Appalachian Orogeny)
Late Carboniferous and Permian
Africa collided with North America
Led to the formation of the Pangaea supercontinent during the Permian Period
Atlas Mountains of Morocco and western Sahara
Video

19. Sonoman Orogeny: 270 to 240 Million Years Ago
Rocky Mountains
North America
Followed the Later Permian Antler Orogeny
Island Arc of Sonomia collided with North America
Angular unconformity between Late Permian and rocks and the Golconda Thrust
Disputed, may not have happened

20. Sonoman Orogeny part of the Cordillera Orogen

23. Terrains of the Cordillera

29. Pennsylvanian Life: 323 to 290 Million Years Ago
Amphibians
Fish
Reptiles
Mammal-like reptiles first appear
Dragonflies (large)

30. Pennsylvanian Forests: Coal making Swamps

31. Pennsylvanian Coal Swamp