Geologic units containing dunite

Dunite

A plutonic rock with M equal to or greater than 90 and ol/(ol+opx+cpx) greater than 90%

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Maryland

Ultramafic Rocks (Early Paleozoic - Late Precambrian (?)): Ultramafic Rocks - Chiefly serpentinite with partly to completely altered dunite, peridotite, pyroxenite, and massive to schistose soapstone; talc-carbonate rock and altered gabbro are common in some bodies.

Vermont

Ultramafic Rocks (Ordovician): Ultramafic Rocks - Dunite, peridotite, and serpentinite

Washington

Pre-Tertiary dunite intrusive rocks (Middle Jurassic): Dunite associated with serpentine on Cypress Island in San Juan Islands and on Mount Chopaka near Oroville in Okanogan County.
Tertiary dunite intrusive rocks (Late Cretaceous): An intimate mixture of saxonite and dunite, partly serpentinized; Twin Sisters mountain area of Whatcom and Skagit Counties. Predominantly dunite and associated serpentinite in Jumbo Mountain area of central Snohomish County.