You are correct Cyrus is buried at Tyrone. I was thinking about Cyrus's father, William Wierman Cook and his brother, John Wierman Cook who are both buried at Old Menallen. Thank you for the correction.
I have you in my tree, the daughter of Thomas Henry & Leore Jean (Moore) Porter. Are you connected to a William Moore who now owns the 1720 property of Peter Cook (1700-1779) in London Grove twp., Chester Co.?
If you would be interested I can send you a GoogleEarth view of where Cyrus lived in Menallen twp., off of Quaker Valley Road. The house is no longer there, but I know where the property is. My email address is firstname.lastname@example.org