Hunter/police officer hears late afternoon vocalizations and breaking branches near Clearfield witnessed in Clearfield County, Pennsylvania

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First, a little information on me. I am 36 and grew up in western NY; where I spent a lot of time hunting, hiking and camping in the woods. I spent four years in the US Marines, where I spent most of my time in the field. Every year I return home for deer season. In 1993, I went deer hunting in Clearfield County, PA. My Uncle (a long time resident of Clearfield) took us out to some state game land outside the city of Clearfield. We traveled in on a old horse trail and went our seperate ways. My Dad and I walked a couple of miles in from the trail. I dropped my dad off in a meadow, told him that I would pick him up after dark and walked about 3/4 mile further in. I found a nice valley and set up for the evening hunt. The valley was surrounded on three sides by a step snow covered 200' hill. About an hour into my hunt, I heard a strange distant noise. It was very deep and repeated every so often. I could not place the noise with anything I have ever heard in the wild, but didn't pay much...