Reconstructing Pangaea

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Presentation transcript:

Reconstructing Pangaea CONTINENTAL DRIFT Reconstructing Pangaea

Glossopteris

Mesosaurus

Lystrosaurus

Glacial Striations (scars)

Coal Deposits

Mountain Ranges

Continental drift: an idea before its time Alfred Wegener Proposed idea of Continental Drift Continental drift hypothesis Supercontinent (one) called Pangaea began breaking apart about 200 million years ago Continents broke apart and then "drifted" to present positions

Fossil Evidence Both Mesosarus and Glossopteris were organisms that would not of been able to travel to the different continents at the distances that the continents are at today.

Wegener’s matching of mountain ranges on different continents

Paleoclimatic (Ancient Climate) evidence

Pangaea approximately 200 million years ago

Pangaea Breakup To view this animation, click “View” and then “Slide Show” on the top navigation bar.

Why was Wegener rejected? People couldn’t observe the plates moving The main objection to Wegener's proposal was its inability to provide a correct mechanism In other words, he couldn’t explain HOW and WHY the continents drift. Wegner did not have a good reason for the driving force of movement of the plates. He claimed it was the same forces that influence tides (gravity).

Where was Wegener missing evidence from?