Look for Maria's birth. and if you find her baptism it might point you in
the direction of the church they were married in. Marriages usually took
place in the Bride's parish.
Although Civil registration for births began in 1845, not every church kept
seperate registers for BMDs until c 1860s. Entries were made in a "Journal"
as they occurred.
If Maria was not a "Local girl" it could be registered in one of the
surrounding parishes. Galloon was just across the river Erne from
Corraclare. People used the waterways a lot for travel.
Remember also that Maria is the Latin for Mary.