Adirondack dome

From Wikimarcellus

The Adirondack Dome (aka Adirondack uplift) is a mountainous section of New York State that rose up about 180 to 65 million years ago. The Utica shale was deposited before the uplift of the Adirondacks, and when this mountainous dome rose up it separated the portion of the Utica shale in the Saint Lawrence Lowlands from that in the central New York Counties of Delaware, Chenango and Otsego.