Inwood Formation (New York)

Tuckahoe marble Stratigraphic range: Late Cambrian, Early Ordovician
Federal Hall National Memorial in Manhattan is constructed using Tuckahoe marble
Lithology
Primary	marble
Location
Region	Westchester County & Inwood, New York
Type section
Named for	Tuckahoe, New York

Tuckahoe marble (also known as Inwood marble) is a type of marble named after the village of Tuckahoe, New York or alternatively the neighborhood of Inwood in Manhattan, New York City. It is found in Eastchester and extending southward to parts of the Bronx, such as Kingsbridge, Mott Haven, Melrose and Tremont and Marble Hill. It has long been quarried at Tuckahoe as well as at other locations in Westchester County, including Ossining, Hastings, and Thornwood, hence the alternate name, Westchester marble. It is part of the Inwood Formation, which also intrudes into western Connecticut. It dates from the Late Cambrian to the Early Ordovician ages (~484 ma ago).

Inwood marble is a high quality marble first discovered in 1822 in the village of Tuckahoe in Westchester County. The marble is from the larger Inwood Formation or deposit, which stretches in a northeasterly direction from mid-Manhattan through southern Westchester. The marble is characterized scientifically as a dolomitic marble and varies in color from a light gray to light green, to a bluish white or brilliant white. A distinctive characteristic is the medium-to-coarse size of the calcite and dolomite particles that primarily compose the stone, which often contains minor amounts of hematite and pyrite. Oxidation of these iron-bearing minerals causes certain varieties of the marble to turn orange-brown when the stone is exposed to weather.