. Annual report of the Regents. New York State Museum; Science. Faulted Kegion of the Mohawk. 35 of the relations, and find that no fault exists. The overlying formations are continuous around the valley, and they are exposed in many outcrops. The supposition that there is a fault at this point may be due to the fact that in the bank along the east side of the stream there are clays containing a very large amount of Utica slate debris which might be mi&taken, on casual observation, for Utica formation in place. At a short distance east, however, there are continuous vertical outcrops from
. Annual report of the Regents. New York State Museum; Science. Faulted Kegion of the Mohawk. 35 of the relations, and find that no fault exists. The overlying formations are continuous around the valley, and they are exposed in many outcrops. The supposition that there is a fault at this point may be due to the fact that in the bank along the east side of the stream there are clays containing a very large amount of Utica slate debris which might be mi&taken, on casual observation, for Utica formation in place. At a short distance east, however, there are continuous vertical outcrops from the Calciferous to Utica beds, matching those on the west side of the valley. The presence of the small inclnsed area of crystalline rocks is due to a slight anticlinal in this vicinity, which has brouofht the crvstalline rocks within reach of the creek for a few hundred yards. Down stream the southwesterly dips carry the formations beneath the surface in regular succession. To the northwestward there is first a slight downward slope in the strata and in the underlyin:;C surface of the crystalline rocks, beyond which the stream runs along the strike, so that in ascending the valley we finally rise high into the Trenton formation at Trenton Falls. Faults. The Little Falls Faults.— The nature of the uplift at Little Falls is shown in the following Figure 1.—Cross section of faults at Little Falls, N. Y., north side of the Mohawk, looking north. v. Utica slate. T. Trenton and Birdseye limestones. C. Calciferous sandrock. A. Archean. Verti- cal scale somewhat exaggerated. This uplift gives rise to the most conspicuous topographic feature of the Mohawk Yalley. Approaching Little Falls from the east the long gentle slopes of the hills of Utica slate are abruptly terminated by a high ridge crossing the valley from south to north. The river cuts through this ridge in a deep, relatively narrow^ goi'g^j lined with high cliffs of Calciferous sandrock and crystalline rocks. In
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