Afternoon sighting while hiking at Mahlon Dickerson Reservation witnessed in Morris County, New Jersey

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On April 15, 2011 my sons and I were camping at Mahlon Dickerson Reservation near Jefferson Township, NJ. The temperature was approximately 52 degrees and the day was overcast. At around 3 PM the three of us struck out from our campsite directly into the timber. There was no overgrowth and the trees were still bare. This is the reason we didn't take any of the marked trails in the area. The terrain is very rocky and over the next hour we hiked and climbed. Circling back into the camp area we emerged at the far end and headed toward the road that runs the length of the campsite. From our position on the road, immediately to our right would be the beginning of a two-way trail. The lower trail heads off and skirts the bottom of the mountain while the upper trail heads up it. As we got to the road I looked over my right shoulder (Why I did this I still do not know. In other words, there was no noise that I heard or any other reason I can think of that made me turn around). There, at the...