Just an update to let everyone know I played hooky yesterday and drove up to Halifax, VA. I discovered that the date in the Halifax Marriage Index was indeed incorrect for Lucy Wilkins/John F. Yancey. When I looked at the actual Marriage Certificate (Xerox copies are available at the courthouse for viewing), the date was clearly Dec 16, 1843, not the 1841 specified in the index.
The moral as always is - don't trust the index - get to the source whenever possible!
F. Neil Simms