Shriek heard in PA woods in early 70's witnessed in York County, Pennsylvania

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Hello, My name is Doug and though I am very reluctant to post this story; I am going to do so anyways. The area that this happened could not be a more unlikely area for a bigfoot occurance then or especially now with all the development of the farmland in the last 25 years which has been extensive and at a phenominal rate. After reading many (if not every last report on this website) and coming across more that a few that have happened in improbable areas (bigfoot running down neighborhood streets and sightings/ vocalizations near condo areas), I decided there just might be some merit in submitting this for review. A skilled researcher might be able to shed some more light maybe. My friends parents owned a small somewhat defunct farm with (I'm guessing maybe 15-20 acres of land -not the best judge on that) They had 3 horses; 2 mares that were allowed out in the field areas; a stabled stallion, and a pony I believe. The barn was in dis-repair and part of the roof had collapsed yea...