Excerpt from Geology of New York, Vol. 3: Comprising the Survey of the Third Geological District
The Third District is formed of fourteen counties and a half, as enumerated in the preceding letter to Governor Seward. It therefore comprises, as will be seen on reference to the map, all the area which exists between the Pennsylvania line on the south, and Lake Ontario and Jefferson county on the north, and a line extending north and south to the limits of the State through Cayuga lake at the west, and the counties of Delaware, Schoharie, Schenectady and Saratoga at the east.
The rocks, or rather mineral products of the third district, belong to three systems, classes, or geological divisions. The first, or oldest to the Primary; the second, to the period which intervenes between the Primary and the coal, well known by the name of Transition class; and the third, to the Quaternary, which includes the alluvial, commencing with the newer pliocene or upper part of the Tertiary, and extending upwards, embracing the most recent deposits of our globe. In the third district, the Secondary class, which commences with the coal, and the Tertiary class, with the exception of its upper part as just mentioned, as well as the Volcanic class, are entirely wanting.
The rocks of the Primary class are in general readily known by their particles being crystalline, from their containing no rolled stones, nor organic remains either animal or vegetable, nor do they show those well defined lines of division so common to the rocks of the succeeding classes of sedimentary origin.
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