North America’s Geologic History

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Presentation transcript:

North America’s Geologic History Geologic history is broken down into 4 major time periods (eras): Precambrian (earliest life) Paleozoic (ancient life) Mesozoic (middle life) Cenozoic (recent life)

Precambrian (earliest life)

Paleozoic (ancient life)

Mesozoic (middle life)

Cenozoic (recent life)

Let’s read about North America’s Geologic History together Textbook pages 118-119

Earth is estimated to be 4.6 billion years old. How old is Earth? Earth is estimated to be 4.6 billion years old. How many times would the length of your life fit into Earth’s lifespan of 4 600 000 000 years? 4 600 000 000 / 15 = 306 666 666.67 times.

Which era has so far been the longest? The Precambrian Era (earliest life) Began 4, 600 million years ago and ended 570 million years ago. This era lasted just over 4, 000 million years. (4, 030 to be exact)

What is the name of the era in which we live? We live in the Cenozoic Era.

Major Geological Events Chart Quietly complete the chart using p. 119 Monday Quiz – what to review: -Alfred Wegener’s theory (continental drift/plate tectonics theory) -North America’s Geological History **Answer questions #1-6 on p.118