adjective (a)

• resembling or containing or abounding in sand; or growing in sandy areas(adj.all)

  Example:
  Arenaceous limestone.
  Arenaceous grasses.
  

  Synonym:
  sandlike, sandy
  Antonym:
  argillaceous, clayey
  

  source: wordnet30
• Sandy or consisting largely of sand; of the nature of sand; easily disintegrating into sand; friable; as, arenaceous limestone.(adjective)

  source: webster1913