Source : Webster's Revised Unabridged Dictionary (1913)

Unstratified \Un*strat"i*fied\, a. (Geol.)
   Not stratified; -- applied to massive rocks, as granite,
   porphyry, etc., and also to deposits of loose material, as
   the glacial till, which occur in masses without layers or
   strata.

Source : WordNet®

unstratified
     adj : not deposited in layers; "glacial till is unstratified"
           [ant: {stratified}]