Molly, I just stumbled across your message. Have you located Jacob Alderman's grave? My husband and I hiked up a mountainside to see it several years ago. It is near Hillsboro, VA, and a fairly easy walk from where you can park your car. Someone has made a concrete marker with the inscription scratched in, perhaps with a nail.
My husband's (Paul T. Mowrey, Jr.) maternal grandmother was Nancy Susan Alderman, daughter of Warren Alderman and Eliza Runnion.