Re: Daniel Quinlivan born April 6, 1835 and Mary Dwyer married Jan. 8, 1878
I search the IFHF's online database @ ROOTSIRELAND.IE. It has abt 19 million B/M/D and other records for MOST Irish counties.
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For Dan(iel) Quinlivan M 1860 +/- 5 yrs, somewhere in Ireland, with a father fore named Dan(iel) and mother Mary, I found 0 records.
Ditto for a marriage to Ellen Barry.
B/M/D records after 1863 are fairly good. It may be that their marriages occurred in areas of Ireland for which records haven't been transcribed yet.
Suggest you visit the IFHF database, register (free), browse, and opt to be notified as it adds records.
Hope this helps. Good luck.