• Miles of uncrowded white sandy beaches extend to the horizon, separating the clear blue ocean and undulating grass-covered dunes.

    Fire Island

    National Seashore New York

Beaches

Sand ripples are a common sight on Fire Island's dynamic shoreline
 

Sandy Shoreline
Fire Island's beaches are composed mainly of white quartz sand of varying grain size. Occasional layers of heavy mineral sands-which include grains of garnet and magnetite-appear as colored bands among the predominantly white sediment. There are also small amounts of feldspar, tourmaline, mica, and other minerals. Occasionally, you will find pebbles or fragments of shell on the beach.

 

Dynamic Beaches
The size and shape of the beach is always changing. While sediment is constantly being moved more or less perpendicular to or from the shoreline by tidal and wave action, the predominant net movement of sediment is along Fire Island's coast, parallel to the shore through the effects of longshore currents. The movement of sediment along the shoreline is called longshore sediment transport.

 

Did You Know?