Geology
The Arthur Kill is an abandoned river channel carved by an ancestral phase of the Hudson River resulting from the blockage of the main channel of the Hudson at the Narrows by moraine or an ice dam. The size of the Arthur Kill channel is large, suggesting that it was, for a time, the primary drainage from the region. However, it could not have been a primary drainage for long because the river did not have enough time to carve a broad flood plain.
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