The foundation to this home was replaced some time ago and the main beam was replaced by a steel I beam.
I guess the thought they didn’t need to remove the original 20" dia log beam, so the left it hanging in mid air supported by nothing more than nails from the joists above just waiting for a time when someone standing underneath will get the shock of their lives and literally think the sky is falling!. If you look close at the center of the picture, you can see the joint at mid span…(with no support underneath)
Actually, the beam is held up by toe nails from the floor joist and the beam should be fairly clean.
If it is not I then use my hi tech demolition carbide tip blade chain and nails does not affect it at all. ha. ha.