page 903 (Supplement): 'Marriages. ...
MAN Thomas, married to Mary Wheaton, the 9th of Aprill, 1678.'
page 238: 'MAN ...
Thomas and Mary Wheaton, July 3, 1676.'
The record in the supplement is in the context of all records for the year 1678, and thus is more likely to be correct than the 1676 date, given in the alphabetical section, where an error in year would have been more easily made. Their first child recorded in the Rehoboth VRs was born in Apr 1679 (VR page 670).