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  On further inspection and a little more thought (but sadly no greater knowledge of all things beast) it could also have been caused by a small Owl. The crux of the problem has to be the below wing scoop at the bottom of the mark. Whether a bat on hearing the bad news of rapidly increasing proximity signals would scoop it's feet + wing membrane just as it struck the snow or whether this somewhat rounder end of the scoop was caused by the tail of a small owl, there's the rub.
  The 'wings' do undercut the snow for most of the scoop and maybe then tucked-in and with the momentum of the strike no further extension of flap was necessary until it was clear of the roof.
  Also the snow is likely to be very loosely laying on the roof so it is not a great deal of material that is now missing.

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