Ronkonkoma Moraine

A map showing Long Island's topography and the generalized locations of the glacial moraines.

The Ronkonkoma Moraine, in the geography of Long Island, forms the southern of two ridges along Long Island's "backbone."[1]

Description

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] Today, the moraine is most prominent in Suffolk County, where it traverses the center of Long Island and forms the South Fork.[3]

Notable summits

• Bald Hill – 331 ft (101 m)[4]
• Telescope Hill – 334 feet (102 m)[5]

See also

• Terminal moraine
• List of glacial moraines

References

1. Geological Survey: Quaternary History of the New York Bight: retrieved 2013-08-23.
2. "Geology of Long Island". Garvies Point Museum and Preserve.
3. Ph.D, Kathleen M. Fallon (2021-09-24). "Long Island's Dynamic History". ArcGIS StoryMaps. Retrieved 2021-12-20.
4. "Holtsville Site The Better One". Suffolk County News. March 7, 1913.("The Bald Hills near Holtsville are the highest land in Suffolk County")
5. "Sixty-Seven Fires Reported Last Year From The Selden Observation Tower". The Mid-Island Mail. August 15, 1935.