The　precipitation　of　the　lamellar-shaped　M23C6　carbide　within　the　dendritic　matrix　of　a　cobalt-base　superalloy　during　thermal　exposure　at　1000　degrees　C　has　been　investigated.　Such　a　precipitation　is　not　commonly　observed　in　cobalt-base　superalloys.　It　is　found　that　M23C6　particles　nucleate　preferentially　at　stacking　faults　(SFs)　in　the　dendritic　matrix　and　grow　along　the　SFs　to　develop　a　lamellar　character.　Additionally,　a　Cr　depletion　zone　is　observed　in　the　vicinity　of　the　lamellar　M23C6　carbide,　which　strongly　supports　the　presence　of　Suzuki　segregation.