The island is one of the southernmost locations in New York City where Fordham gneiss, a type of bedrock commonly found beneath the South Bronx, can be seen above ground. The gneiss outcropping was surrounded by dolomite, which was worn down by East River currents, creating the current island. The layer of bedrock is shallow and is covered by glacial till, and a 2012 study found no evidence of ponds or streams on the island. Since the 19th century, the island's natural topography has been modified drastically, and fill has been added to Roosevelt Island to increase its area. An ancient fault line, known as Cameron's Line, runs within the East River between Roosevelt Island and Queens.

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A proposito di questa mappa

Nome: Mappa topografica Roosevelt Island, altitudine, rilievo.

Luogo: Roosevelt Island, Manhattan, New York County, New York, 10044, United States (40.74961 -73.96154 40.77296 -73.94003)

Altitudine media: 13 m

Altitudine minima: -6 m

Altitudine massima: 52 m

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