Palisades of the Hudson

National Natural Landmark

IN BRIEF
Located mainly in Rockland County and extends into Bergen County, New Jersey)--Along western bank of Hudson River from Sparkill, New York south 13 miles to below the George Washington Bridge in New Jersey. This is the best example of a thick diabase sill formation known in the United States. Columnar jointing, an olivine zone and thermal metamorphic effects are attributes found in rare combination at this site. The glaciated crest provides impressive evidence of the Pleistocene glacier. Owner: State

DESIGNATION DATE
June 1983