The two Troughs

The mapping of the Capitol district, New York, consisting of the Schenectady, Cohoes, Albany, and Troy quadrangles, has clearly brought out certain stratigraphic and paleogeographic features of the Cambrian, Ozarkian, Canadian, and Ordovician formations of the district that had already been suggested by work on the Saratoga and Schuylerville quadrangles and which appear to be of more than local interest.

The district is a small sector of the western part of the great belt of Paleozoic unrest and mobility known as the Appalachian geosyncline. The stratigraphic work, which was made difficult by complicated Taconic and Appalachian folding and extensive overthrusts, has disclosed at least two completely different sets of formations, which range in age from Lower Cambrian to Middle Ordovician. These formations were deposited in two nearly parallel troughs or channels, which in the text on the Saratoga and Schuylerville quadrangles have been called the eastern and . . .

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