Today when I was researching William Irwin in LACK TOWNSHIP ASSESSMENT OF 1763 of Cumberland County, PA which later becomes Milford Township and finally today as Beale Township in Juniata County, PA; I came across this map which shows portions of where I think our William Irwin lived in early 1700’s. The history of Beale Township, PA http://freepages.genealogy.rootsweb.ancestry.com/~milliken/alguss/beale.html
states that that his land extended across the creek. The only creek in Beale Township is Tuscarora Creek that divides Beale Township from Spruce Hill. So, it appears that William Irwin lived between Beale and Spruce Hill Township. Spruce Hill Township was formed by dividing Turbett on September 10, 1858.
Interesting note: William Stewart married an Irwin before February 3, 1755 and he died and his widow married John William.
William Stewart got a warrant, February 3, 1755, for a tract on the south side of Tuscarora. He was killed by Indians before the land was surveyed. John Williams, hunter, married the Widow Stewart, left his "old place" to Christy, as stated above, and moved to the Stewart place, which, January 14, 1788, he warranted in his own name, not forgetting, by an unnatural line, to include the best part of his old place, thus making two hundred and ninety-nine acres, and now owned by J. Nevin Pomeroy, being just across the creek from his store.
Captain John Williams was wounded in the battle of Brandywine. He was the grandfather of Captain John P. Wharton, father of John William, Jr., and grandfather of Joseph Williams.
William Stewart came from the Yellow Breeches and was married to an Irwin.
Above Erwin, on the creek, April 27, 1767, there was taken up two hundred and six and sixty acres by John Buchanan, and "if over three hundred acres, the upper part to James Buchanan, Jr., named Widow's Delight, so-called." Here Lewis Shuman and David Sulouff lived; now Joseph Sheesley.