Source : Webster's Revised Unabridged Dictionary (1913)

Interstratified \In`ter*strat"i*fied\, a. (Geol.)
   Stratified among or between other bodies; as, interstratified
   rocks.

Source : WordNet®

interstratified
     See {interstratify}

interstratify
     v : arrange rocks in alternating strata
     [also: {interstratified}]