During the Wisconsinan glaciation, the New York City region was situated at the edge of a large <answer>ice sheet</answer> over 1,000 feet in depth. The <answer>ice sheet</answer> scraped away large amounts of soil, leaving the bedrock that serves as the geologic foundation for much of New York City today. Later on, the <answer>ice sheet</answer> would help split apart what are now Long Island and Staten Island.
Long Island and Staten Island were split in half by what geographical phenomenon?
ice sheet