Evolution of the Earth 13.7 Billion Years in the Making

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Presentation transcript:

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

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

Proterozoic to Cambrian Transition Microscopic Life To Megascopic Life

Life and Calcium Carbonate: 540 million years ago Biogentic Limestones

Life and Calcium Carbonate: 540 million years ago Biogentic Limestones

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

Trilobites

Cambrian Explosion All modern taxa and many extinct ones

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

Paleozoic Life

Precambrian to Devonian Life

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

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.