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Generalized Geologic Map of the Conterminous United States
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  The North American Tapestry of Time and Terrain

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Adirondack Mountains

  Close-up of adirondack mountains on mapThe Adirondack Mountains form most of northern New York state. They are an uplifted complex of Precambrian metamorphic rocks, like the Llano Uplift in Texas, part of an ancient continental province. The Paleozoic sedimentary strata that flank these older rocks once covered them. When these Precambrian rocks were deeply buried, the pressure was alleviated by the development of intersecting faults and joints, creating the rectilinear surface texture that characterizes the birds-eye view of the mountains today.