I see an unusual cadence in the end of Debussy's Prelude of Pour le Piano. It is v7 - i in A minor. Is there an actual name for this?
(Chord Progression: Fmaj7 - Abaug7 - Gaug7 - C9 - Em7 - Am)
In the late 19th and early 20th centuries, composers experimented with many deviant final cadences. Most of them can be classed as variants of the existing formulas (authentic and plagal). This one is a variant of the authentic cadence, as I'm sure you noticed.