rupestrian
/ruːˈpɛstrɪən
/adjective
(Of art) done on rock or cave walls.The Siega Verde rupestrian art site covers a 1.5 km area on the left bank of the Águeda River, a left tributary of the Duero River.
Origin
Late 18th century: from modern Latin rupestris 'found on rocks' (from Latin rupes 'rock') + -an.