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Home Page Newsletter Events Trail Map Directions Photo Gallery Forum Contact Us New Membership Renew Membership Gift Membership ContributionDonation More Welcome to Bergen County39s Hidden Gem of Nature Palisades Nature Association PNA is a nonprofit organization of conservationminded people founded in 1946 to preserve the natural character of the Palisades cliffs and to develop a wild sanctuary. Today PNA administers Greenbrook Sanctuary. Members are required to follow the rules and regulations to support our conservation efforts ensure the safety of fellow members preserve the wildlife and natural environment of Greenbrook Sanctuary. Rules Regulations No pets are allowed in the Sanctuary in order to preserve the natural environment No fishing No biking is allowed on the trails No cross country skiing No sharing or loaning Sanctuary keys Members must lock the gate upon entering and leaving exercise care not to allow nonmembers to enter For members and visitor39s protection names must be logged on the registration list at the bulletin board in the parking area The Sanctuary is open to members dawn to dusk To prevent fires and litter smoking is allowed only in the parking area and eating is allowed only in the picnic area Members must remain on marked trails only and must not remove or disturb plants or animals Snowshoes are permitted on the trail Member39s guests are welcome but membership is required if visits are repeated Family members under 17 years of age must be accompanied by an adult at all times All groups school children adults or otherwise must arrange for the trip to the Sanctuary through the DirectorNaturalist Our Nature Preserve is a special place and we need your help to keep it that way.