Postpositions
Position 18: Postpositions
Morphemes that are derivational or thematic and carry a locative or relational meaning something like
English preposition (e.g. by the lake, at the store).  
They must follow a noun or a pronoun which is a noun of Position 19 refereed to as o in the following.
Note: the postposition/object of the postposition can act as a "word unit" by itself apart from a verb stem.

o-a                              on, against, in contact with, exerting a force against
o-a³iqa                       being icy from spray
o-ahdyidehch'         on top of o
o-at                             on o
o-aq'a                       clubbing o
o'aq'a                        refers to the depression made by an object in soft ground or snow.
o-ch'                          in the direction of
see Tenebaum  section 480, page 191 or the 90+ postposition morphemes