1. Evolution of the Earth 13.7 Billion Years in the Making
PART 3: Cambrian
Dr. Gregg Wilkerson
Earth Science
Bakersfield City College

2. Rodinia broke up into Lauritania and Gondwanaland: 600 to 800 Million Years Ago

3. Proterozoic to Cambrian Transition
Microscopic Life To
Megascopic Life

4. Life and Calcium Carbonate: 540 million years ago
Biogentic Limestones

5. Life and Calcium Carbonate: 540 million years ago
Biogentic Limestones

7. The Cambrian Explosion of Life: 540 Million Years Ago
25% Oxygen
Great Diversity of Life

8. Trilobites

9. Cambrian Explosion
All modern taxa and many extinct ones

10. The Great Cambrian Transgression
Shoreline migrated inland in North America, east to west
Observed in the Grand Canyon strata

16. Paleozoic Life

17. Precambrian to Devonian Life

18. Caladonian Orogeny: 490–390 million years ago
Caused by the closure of the Iapetus Ocean when the continents and terranes of Laurentia, Baltica and Avalonia collided

19. Phases of the Caladonian Orogeny
East Greenland Orogen, formed from Cryogenian Neoproterozoic to Devonian
Taconic phase – A mountain building period that affected most of New England in the NE U.S. and Canada during the Ordovician Period.
Acadian phase in the Eastern U.S. during Silurian and Devonian Periods.