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The Ronkonkoma Moraine, a terminal moraine, predates the Harbor Hill Moraine (which reached Long Island during the Wisconsin Glacial Episode); the Harbor Hill Moraine cut through the Ronkonkoma Moraine's western portions. [2] The Ronkonkoma Moraine and the Harbor Hill Moraine intersect at Lake Success in western Nassau County. [2]
The northern moraine, which directly abuts the North Shore of Long Island at points, is known as the Harbor Hill moraine. The more southerly moraine, known as the Ronkonkoma moraine, forms the "backbone" of Long Island; it runs primarily through the very center of Long Island, roughly coinciding with the length of the Long Island Expressway.
The Harbor Hill Moraine, skirting the North Shore, represents the terminal moraine of the most recent advance of the Wisconsinian glaciation, which reached its most southward advance about 18,000 years ago; the earlier Ronkonkoma Moraine, much cut through by outwash streams from the Harbor Hill Moraine, lies to the southeast.
One of the earliest glaciers during the Ice Age extended into the ocean, and when it stopped and retreated, it left a ridgeline, called the Ronkonkoma Moraine, that stretches from Long Island to ...
The northern moraine, which directly abuts the North Shore of Long Island at points, is known as the Harbor Hill moraine. The more southerly moraine, known as the Ronkonkoma moraine, forms the "backbone" of Long Island; it runs primarily through the very center of Long Island, roughly coinciding with the length of the Long Island Expressway.
The Bald Hill area is part of the Ronkonkoma Moraine, which runs east to west along the center of the Town of Brookhaven, and marks where the glacier which formed Long Island stopped its advance. [6] When first settled in the late 18th century, the area was called "Bald Hills."
Ronkonkoma Moraine; S. Seven hills of Seattle; T. Tinley Moraine; W. Withrow Moraine and Jameson Lake Drumlin Field This page was last edited on 13 January 2023, at ...
The lake marks the location where the Harbor Hill Moraine and the Ronkonkoma Moraine meet one another. [ 4 ] [ 5 ] West of Lake Success, the younger Harbor Hill Moraine overrode the older Ronkonkoma Moraine.