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In page Sussex County, New Jersey:

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Dividing the Kittatinny Valley (and the Ridge and Valley Province) from the Highlands region is a narrow fault of Hardyston Quartzite. Many of the mountains in the Highlands are not part of a solid, linear ridge and tend to randomly rise from the surrounding land as the result of folds, faults and intrusions. Elevations in the Highlands region range from 1,000 to 1,500 feet.[1]:p.3 The more prominent mountains in this area are Hamburg Mountain (elevation: 1,495 feet (456 m)), Wawayanda Mountain (elevation 1,448 feet (441 m)), Sparta Mountain (elevation: 1,232 feet (376 m)) and Pochuck Mountain (elevation: 1,194 feet (364 m)) which form a ridge along the county's eastern flank.