Unknown Couple

This photo was found in my GGGrandmother's photo album. This is a tin-type.

Does anyone recognize this couple? The woman is standing wearing a ruffled dress with a button down jacket and a scarf. He is seated to her left wearing a suit and boots, and has a beard. The backdrop is plain and the ground shows that this photo was taken outdoors on the grass. Time period for this photo is estimated around the late 1800s.