Farewell rock

from The Collaborative International Dictionary of English v.0.48

Farewell \Fare"well`\, a.
   Parting; valedictory; final; as, a farewell discourse; his
   farewell bow.
   [1913 Webster]

         Leans in his spear to take his farewell view.
                                                  --Tickell.
   [1913 Webster]

   {Farewell rock} (Mining), the Millstone grit; -- so called
      because no coal is found worth working below this stratum.
      It is used for hearths of furnaces, having power to resist
      intense heat. --Ure.
      [1913 Webster]