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Epicgenius (talk | contribs) split sections, also trim paragraph about mammoth-remain claims |
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The river is navigable for its entire length of {{convert|16|mi}}. In 1939 it was reported that the stretch from [[The Battery (Manhattan)|The Battery]] to the former [[Brooklyn Navy Yard]] near [[Wallabout Bay]], a run of about {{convert|1000|yd}}, was {{convert|40|ft}} deep, the long section from there, running to the west of Roosevelt Island, through Hell Gate and to [[Throggs Neck|Throg's Neck]] was at least {{convert|35|ft}} deep, and then eastward from there the river was, at mean low tide, {{convert|168|ft}} deep.<ref name=fed420 />
The broadness of the river's channel south of Roosevelt Island is caused by the dipping of the hardy [[Fordham gneiss]] underlying the island under the less strong [[Tuckahoe marble|Inwood marble]] which lies under the river bed.<ref name=concrete90 /> Why the river turns to the east as it approaches the three lower
===Islands===
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