. Annual report of the Regents. New York State Museum; Science. PLEISTOCENE GEOLOGY OF NASSAU CO. AND BOROUGH OF QUEENS 631. Fig. 7 A fold-fault in clays at southern end of Center island in Oyster Bay harbor overlain by at least 20 feet of clayey sands passing above into cleaner sand. These beds dip gently east. The second cnt west shows more of the white sands, dip uncer- tain, overlain by glacial gravel with small boulders. The third cut w^est exhibits cross-bedded, white clayey sands, presumably Creta- ceous, overlain by 10 or 12 feet of glacial gravels and sands w^ith small boulders. The s
. Annual report of the Regents. New York State Museum; Science. PLEISTOCENE GEOLOGY OF NASSAU CO. AND BOROUGH OF QUEENS 631. Fig. 7 A fold-fault in clays at southern end of Center island in Oyster Bay harbor overlain by at least 20 feet of clayey sands passing above into cleaner sand. These beds dip gently east. The second cnt west shows more of the white sands, dip uncer- tain, overlain by glacial gravel with small boulders. The third cut w^est exhibits cross-bedded, white clayey sands, presumably Creta- ceous, overlain by 10 or 12 feet of glacial gravels and sands w^ith small boulders. The section shows no dislocation. In the first of these sections the measured exposure is evidently a part of the Columbia; in the second cut, the glacial gravels mantle the eroded surface of the pre-Pleistocene series, having been deposited subsequently to the deformation and gullying of the beds. These top beds, by their boulders and lack of strat- ification, as well as their relation to the eroded clays, evidently pertain to the last drift. The sections show, however, that the Columbia man- tles over and is wrapped about masses of the pre-Pleistocene series, as previously stated on p. 622. Similar partial sections occur on Great E"eck near Manhasset. In the sand pits northwest of Port Washington, the pre-Pleisto- cene clays are also involved in folds, giving rise to a structure, the upper member of which is a gravel and sand bed of the Columbia formation, itself clearly older than the sands of the Port Washing- ton delta yet to be described (p. 646). In this instance the axis of the anticlinal structure lies north and south, and the dislocation may be of a relatively late date, even so late as the time of forma- tion of the delta named, when the ice lay deeply embayed along the north shore of Manhasset neck and wdien an easterly movement in the mass might be expected, since the ice at this locality w^as on the eastern margin of a glacial lobe at the mouth of the Hudson valle
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