Steve, I would guess Marten, but it would have to be in context of where and when I suppose. Did you note any chest markings? I guess possibly a big Bull Mink.
I didn't think Fisher and Marten would clash too much, but I guess that's just or niavity on my part. I wouldn't think they'd occupy much of the same biomes, but that might just be my east of the mountains thinking. To me, Marten have always been alpine or Mountain, and Fisher have always been Creek or bottoms. I guess there are always creeks on the mountain. hmmmm