lacustrine deposits

from The Collaborative International Dictionary of English v.0.48

Lacustral \La*cus"tral\, Lacustrine \La*cus"trine\, a. [L. lacus
   lake: cf. F. lacustral, lacustre.]
   Found in, or pertaining to, lakes or ponds, or growing in
   them; as, lacustrine flowers.
   [1913 Webster]

   {Lacustrine deposits} (Geol.), the deposits which have been
      accumulated in fresh-water areas.

   {Lacustrine dwellings}. See {Lake dwellings}, under {Lake}.
      [1913 Webster]