has it resulted in formation of sheets of ice?
No, but  the ice sheet melted from the north at a moraine, water would begin to pond in the divide between a moraine and the ice front.
Wisconsin glaciation
the ice sheet melted from the north at a moraine, water would begin to pond in the divide between a moraine and the ice front. 
when did immigrants stop coming to ellis island UNANSWERABLE where is this island located? New York Harbor can you mention any geographical features of the islands? Ellis Island is in Upper New York Bay, east of Liberty State Park and north of Liberty Island. While most of the island is in Jersey City, New Jersey, a small section is an exclave of New York City. are there any military facilities? Ellis Island was also used by the military for almost 80 years. By the mid-1790s, as a result of the United States' increased military tensions with Britain and France, a U.S. congressional committee drew a map of possible locations for the First System of fortifications to protect major American urban centers such as New York Harbor. what was the state of this place before colonialization? The present-day Ellis Island was created by retreating glaciers at the end of the Wisconsin glaciation about 15,000 years ago. The island was described as a "hummock along a plain fronting the west side of the Hudson River estuary. what is this glaciation process that you just mentioned? It refers to the most recent glacial period of the North American ice sheet complex. This advance included the Cordilleran Ice Sheet, which nucleated in the northern North American Cordillera when did it happen? From approximately 75,000 to 11,000 years ago
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Wisconsin glaciation [SEP] Formation of proglacial and prehistoric lakes
Whenever the ice sheet melted from the north at a moraine, water would begin to pond in the divide between a moraine and the ice front. The ice would act as a dam as water could not drain through the ice sheet, which in the Wisconsin period covered most of the proglacial river valleys. Numerous small, isolated water bodies formed between the moraine and the ice front. As the ice sheet would continue to melt and recede northward, these ponds combined into proglacial lakes. In areas without an available outlet, the water levels would either continue to rise until reaching one or more low spots along the rim of a moraine, or the ice sheet would retreat, opening access to a lower portion of the moraine.