Stratigraphic usage of the “Herkimer Sandstone,” the uppermost Clinton unit in east-central New York, has been inconsistent. In this revision, the Herkimer is considered a formation with western and eastern lithofacies, each of which is called a member. The Joslin Hill Member, consisting of shale, dolostone, sandstone, and hematitic beds, represents the Herkimer Formation in the western part of the outcrop belt (Oneida, Rome, and Utica quadrangles). In the vicinity of Ilion Gorge, the Herkimer undergoes an eastward change into an orthoquartzite for which the name Jordanville Member is proposed.

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