There are two headstones for Joanna, as shown in this memorial page. The problem is that the newer stone is 30 yards away from the older stone. Why this is? Don't know. Was the body moved to the newer location? Don't know.
Allison lineage back to Thomas Allanson, English extraction, London.
Thomas Allanson/Mary Roberts Charles Allanson/ ? Posey Thomas Allison/Barbary Burch Charles Allison/Barbara Moore Charles Allison, Jr./Mary Blackmore Erasmus Allison/Mary Carr Charles Allison/Jane Crane David J. Allison/Joanna Gibson