That’s good advice that Claire gave you PDavis. You should definitely check the original record of the marriage in the parish register. They are free at http://www.nli.ie. Go to the Family History section.
Also, if there is an address given in the marriage record, follow this up in Griffith’s Primary Valuation, which will date from around the time the family married/migrated.
If thete isn’t an address, look at who the witnesses were to the marriage and then comb through the register for other possibly relevant marriages. It may be possible to get a lead that way.