Vocals and thrown objects experienced by two friends exploring witnessed in Montgomery County, Maryland

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My friend and I had been searching for a place called Dickerson quarry in Dickerson Md, and had just located it on a map. We had to park on some railroad tracks by the aquaduct and walk through some very dense sticker bushes and overgrowth to find the place. To describe the quarry, it is located in the middle of the woods. It is about 75 yards long and about 30 yards wide with very tall cliffs, about 50 to 80 feet tall in some places. However there are a few places where you can walk down to the waters edge. As we were approaching the quarry, we heard this very loud screeching sound coming from about 25 yards away in the overgrowth. It was very loud and it actually startled us when it first started. The only way to describe the sound would be to say it sounded like a pig getting slaughtered. We stopped walking and waited but it stopped, whatever it was. We continued walking and found the quarry, hearing the strange sound several more times, always coming from a different place. We made...