Re Catherine Dutton vs Catherine Darting. Same person, I believe Darting is the correct name. Land management records indicate the Darting family living in the same area as Catlett Tiffey, and some of the Darting family also migrated to Iowa.
Catlett Tiffey/Cathering Darting were my great granparents.
My e-mail address is
letif@fidalgo.net if you would like to correspond directly.