1 / 16

The Geologic History of Long Island Sound

Discover the fascinating geological history of Long Island Sound, from volcanic origins 500 million years ago to the formation of Long Island and its final shaping by glaciers. Explore how Pangea, sediments, glaciers, and shifting sea levels have shaped this unique coastal area. Uncover how the Sound transformed into the beautiful waters we see today, inviting further study.

petersend
Download Presentation

The Geologic History of Long Island Sound

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related