| Marlboro Mountains | |
|---|---|
 Illinois Mountain, the second highest ridge of the Marlboro Mountains, seen from Tony Williams Park in Lloyd, New York. | |
| Highest point | |
| Peak | Marlboro Mountain |
| Elevation | 1,127 ft (344 m) |
| Coordinates | 41°40′43.31″N 74°00′43.6″W / 41.6786972°N 74.012111°W |
| Dimensions | |
| Length | 25 mi (40 km) north–south |
| Geography | |
 | |
| Country | United States |
| State | New York |
| Geology | |
| Rock age | Ordovician |
| Rock type | Sedimentary |
The Marlboro Mountains, sometimes Marlborough Mountains, are a group of hogbacked mountains arranged in a 25-mile-long (40 km) ridge extending from Newburgh, New York, to just south of Kingston, New York. Considered to be part of the Ridge and Valley Appalachians, the mountains, which reach elevations over 1,100 feet, form an imposing geologic barrier just west of the Hudson River. They subdivide the relatively flat Hudson River Valley (a section of the Great Appalachian Valley) to create the Wallkill Valley further west.[1] Rising abruptly on their eastern flanks, the Marlboro Mountains are known for their sweeping views of the region.
- ^ Waines, Russell H. (Editor). New York State Geological Association, 39th Annual Meeting – Guide Book to Field Trips. S.U.N.Y College at New Paltz, May, 1967. Available Online Archived 2011-07-23 at the Wayback Machine