Hi, a copy of the records can be found on microfilm at PRONI,
R.C. Clonleigh and Camus (Derry diocese)
[Partly in Camus parish]
Baptisms, 1773 -95, 1836-7 and 1853-80; marriages,
1778-81 and 1843-81. MIC1D/61
A transcription of the records can also be viewed on line for a fee on the roots ireland site, unfortunately RC marriage records from the period do not usually contain fathers names only witnesses.
The records for the Parish date back to the late 1700's so you may be able to get back another generation or 2 through the church records. Had a quick look for Daniel Devennys birth record (based on age in 1901 census) and found a Daniel Devenny baptised 1845, father Daniel Devenny, mothers name Bell
Regards