Historical Introduction

The “Clinton group” of western New York has been supposedly a well known formation. Hall (2)2, in 1843, described the section on the Genesee River at Rochester, whose various subdivisions of shale and limestone he believed he had correctly traced eastward to the limit of his district (namely, Red Creek), and he affirmed the stratigraphic equivalence of five of these to the series of sandy shales at Clinton, in central New York, described in the preceding year by his colleague on the Survey, Vanuxem (1). Hall also followed the same group of strata westward to the Niagara River, where he correctly noted that the “Clinton” portion had diminished in thickness by the nearly total loss of its shale members, thus becoming a continuous massive limestone.

It should be recalled that two of the sections just mentioned, namely, the Genesee gorge at Rochester and the Niagara gorge above Lewiston, are the

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