1) Above 2) Atop 3) Bedded 4) Layered 5) Overlying 6) Superjacent 1) Added 
• (imp. & p. p.) of Superimpose
[adj] - added or imposed without integration
This ambiguous description in the context of a wine address is to be understood from the context. It may in fact concern a wine that has been stored too long and is therefore overaged, or the masking (covering) of the wine's own smell or taste by an obtrusively dominant tone such as wood (in the case of barrique ageing).
(of a stream or drainage system) having a course not adjusted to the structure of the rocks presently undergoing erosion but determined rather by a prior erosion cycle or by formerly overlying rocks or sediments.