Hi
I have had another look for you and may have something of interest, see what you think?
The Oxfordshire Family History Society (OFHS) have an Oxfordshire Marriage Index 1538 -1837.
In that index is the following;
Sarah SAUNDERS of Yarnton married at St Mary Magdalen Church, Oxford on 15 June 1718 to
Thomas DANSBY of Farthinghoe, Northants.
In the transcribed parish records of St Mary Magdalen the marriage is there but the grooms last name has been entered differently - I think by mistake.
the entry records a marriage on 15 June 1718 between Thomas DARNSLEY of Farthinghoe, Northants and Sarah SAUNDERS of Ettington, Oxon (Warwicks). She may have been from Ettington originally and staying in Yarnton?
There is NO baptism for Sarah in the transcribed PR's for St Bartholomew Church, Yarnton.
I think the marriage in the Marr Index is yours and a search of the Northamptonshire PR's -specially Ettington is needed now for Sarah's baptism?
Anyway I hope this all works for you?
NDRFT