Well this is a pretty thin marriage record, not even parents' names!
Francois Arsenault, bachelor, and Theotise Saulnier, spinster, married January 8, 1880 by banns. Witnesses John Arsenault & Marguerite Saulnier.
You can be married by license or banns - banns (declaration of intent to marry) were read in church for a set number of consecutive Sundays. If no one opposed the union, you got married. So, there might be a parish register somewhere??