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The Geologic History of Long Island Sound

The Geologic History of Long Island Sound. 500 million years ago. Volcanoes form in a now extinct ocean. 450 million years ago. Volcanic islands crash into what will be North America forming the bed rock of Long Island and L.I. Sound. 300 million years ago. Long Island Sound is a swamp

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The Geologic History of Long Island Sound

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  1. The Geologic History of Long Island Sound

  2. 500 million years ago Volcanoes form in a now extinct ocean.

  3. 450 million years ago Volcanic islands crash into what will be North America forming the bed rock of Long Island and L.I. Sound.

  4. 300 million years ago Long Island Sound is a swamp at the edge of newly formed mountains. Pangea

  5. 135-65 million years ago Sediments are deposited by numerous rivers coming from the mts.

  6. 65-2 million years ago Sediments are carved by a river forming a valley.

  7. 150,000-22,000 years ago Series of glaciation and warming periods between 2-5 glaciers cover the Sound.

  8. 22,000-20,000 years ago Last glacier bulldozes the sediment from the river valley making it deeper. Then it begins melting at its edge, dumping sand, rocks and boulders on Long Island. Glacier

  9. 20-16,000 years ago Water from the melting glaciers forms a lake in what is now the sound.

  10. 15,000 years ago Sea levels rise high enough to spill over into Sound in the east.

  11. 11,000 years ago Sea Levels continue to rise The ocean breaks through on the west forming Long Island. Sea Rises

  12. Long Island Sound today Further Study

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